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SUGAR MANUFACTURE Sugar-See also:cane is a member of the grass See also:family, known botanically as Saccharum officinarum, the succulent stems of which are the source of cane sugar. It is a tall perennial grass-like plant, giving off numerous erect stems 6 to 12 ft. or more in height from a thick solid jointed See also:root-stock. The stems are solid and marked with numerous shining, polished, yellow, See also:purple or striped See also:joints, 3 in. or less in length, and about 11 in. thick. They are unbranched and See also:bear in the upper portion numerous See also:long narrow grass-like leaves arranged in two rows; the See also:leaf springs from a large sheath and has a more or less spreading blade 3 ft. in length or longer, and 3 in. or more wide. The small See also:flowers or spikelets are See also:borne in pairs on the ultimate branches of a much branched feathery plume-like terminal See also:grey inflorescence, 2 ft. or more long. See also:Production of flowers is uncertain under cultivation and See also:seed is formed very rarely. The plant is readily propagated by cuttings, a piece of .the See also:stem bearing buds at its nodes will root rapidly when placed. in sufficiently moist ground. The sugar-cane is widely, cultivated in the tropics and some sub-tropical countries, but is not known as a See also:wild plant. Its native See also:country is unknown, but it probably originated in See also:India or some parts of eastern tropical See also:Asia where it has been cultivated from See also:great antiquity and whence its cultivation spread westwards and eastwards. See also:Alphonse de See also:Candolle (Origin of Cultivated See also:Plants, p. 158) points out that the See also:epoch of its introduction into different countries agrees with the See also:idea that its origin was in India, See also:Cochin-See also:China or the See also:Malay See also:Archipelago, and regards it as most probable that its See also:primitive range extended from See also:Bengal to Cochin-China. The sugar-cane was introduced by the See also:Arabs in the See also:middle ages into See also:Egypt, See also:Sicily and the See also:south of See also:Spain where it flourished until the abundance of sugar in the colonies caused its cultivation to be abandoned. Dom Enrique, See also:Infante of See also:Portugal, surnamed the Navigator (1394—1460) transported it about 1420, from See also:Cyprus and Sicily to See also:Madeira, whence it was taken to the Canaries in 1503, and thence to See also:Brazil and Hayti See also:early in the 16th See also:century, whence it spread to See also:Mexico, See also:Cuba, See also:Guadeloupe and See also:Martinique, and later to See also:Bourbon. It was introduced into Barbadoes from Brazil in 1641, and was distributed from there to other See also:West See also:Indian islands. Though cultivated in sub-tropical countries such as See also:Natal and the See also:Southern states, of the See also:Union, it is essentially tropical in its requirements and succeeds best in warm See also:damp climates such as Cuba, See also:British See also:Guiana and See also:Hawaii, and in India and See also:Java in the Old See also:World. The numerous cultivated varieties are distinguished mainly by the See also:colour of the internodes, whether yellow, red or purple, or striped, and by the height of the See also:culm. Apart from the sugar-cane and the See also:beet, which are dealt with in detail below, a brief reference need only be made here to See also:maple sugar, See also:palm sugar and See also:sorghum sugar. Maple Sugar.—This is derived from the See also:sap of the See also:rock or sugar maple (Ater saccharinum), a large See also:tree growing in See also:Canada and the See also:United States. The sap is collected in See also:spring, just before the foliage develops, and is procured by making a notch or See also:boring a hole in the stem of the tree about 3 ft. from the ground. A tree may yield 3 gallons of juice a See also:day and continue flowing for six See also:weeks; but on an See also:average only about 4 lb of sugar are obtained from each tree, 4 to 6 gallons of sap giving I lb of sugar. The sap is purified and concentrated in a See also:simple manner, the whole See also:work being carried on by farmers, who themselves use much of the product for domestic and culinary purposes. Palm Sugar.—That which comes into the See also:European See also:market as Jaggery or khaur is obtained from the sap of several palms, the wild date (See also:Phoenix sylvestris), the See also:palmyra (Borassus fiabellifer), the coco-See also:nut (Cocos nucifera), the gomuti (Arenga saccharifera) and others. The See also:principal source is Phoenix sylvestris, which is cultivated in a portion of the See also:Ganges valley to the See also:north of See also:Calcutta. The trees are ready to yield sap when five years old; at eight years they are mature, and continue to give an See also:annual See also:supply till they reach See also:thirty years. The collection of the sap (toddy) begins about the end of See also:October and continues, during the cool See also:season, till the middle of See also:February. The sap is See also:drawn off from the upper growing portion of the stem, and altogether an average tree will run in a season 350 lb of toddy, from which about 35 lb of raw sugar—jaggery —is made by simple and See also:rude processes. Jaggery production is entirely in native hands, and the greater See also:part of the amount made is consumed locally ; it only occasionally reaches the European market. Sorghum Sugar.—The stem of the See also:Guinea See also:corn or sorghum (Sorghum saccharatum) has .long been known in China as a source of sugar. The sorghum is hardier than the sugar-cane; it comes to maturity in a season; and it retains its maximum sugar content a considerable See also:time, giving opportunity for leisurely harvesting. The sugar is obtained by the same method as cane sugar. Cane Sugar Manufacture.—The value of sugar-canes at a given See also:plantation or central factory would at first sight appear commercial to vary directly as the amount of saccharine See also:con-values of tamed in the juice expressed from them varies, sugar-canes. and if canes with juice indicating 90 Beaume be made a basis of value or See also:worth, say at 1os. per ton, then canes with juice indicating in degrees Beaume 10° 9° 8° 7° 6° and containing in sugar . . 18•o5 %l 16'23% 14.42 % 12'61% Io.8o % would be worth per ton . . . II/Iy 1o/– 8/too 7/9: 6/8 But this is not an accurate statement of the commercial value of sugar-canes—that is, of their value for the production of sugar to the planter or manufacturer—because a properly equipped and balanced factory, capable of making See also:loo tons of sugar per day, for too days' See also:crop, from canes giving juice of g° B., or say 1o,000 tons of sugar, at an aggregate See also:expenditure for manufacture (i.e. the annual cost of See also:running the factory) of £3 per ton, or f30,000 per annum, will not be able to make as much sugar per day with canes giving juice of 8° B., and will make still less if they yield juice of only 6° B. In practice, the expenses of upkeep for the See also:year and of manufacturing the crop remain the same whether the canes are See also:rich or poor and whether the crop is See also:good or See also:bad, the See also:power of the factory being limited by its power of evaporation. For example, a factory able to evaporate 622 tons of See also:water in 24 See also:hours could treat l000 tons of canes yielding juice of 90 B., and make therefrom 100 tons of sugar in that time; but this same factory, if supplied with canes giving_ juice of 6° B., could not treat more than 935 tons of canes in 24 hours, and would only make therefrom 62.2 tons of sugar. The following table may be useful to planters and central factory owners. It shows the See also:comparative results of working with juice of the degrees of See also:density mentioned above, under the conditions described, for one day of 24 hours, and the real value, as raw material for manufacture, of cane giving juice of 6° B. to to° B., with their apparent value based solely on the percentage of sugar in the juice. The canes in each See also:case are assumed to contain 88 % of juice and 12 % of fibre, and the extraction by milling to be 75 % of the See also:weight of canes—the evaporative power of the factory being equal to 622 tons per 24 hours. The factory expenses are taken at £30,000 per annum, or £3 per ton on a crop of Io,000 tons (the sugar to cost £8 per ton all told at the factory)—See also:equivalent to £3oo per day for the loo working days of crop time. Degrees Beaume. 6° 7° 8° 9° 10° Tons of canes 935.6 956.2 977.4 See also:I000 1023.8 crushed per day Tons of juice ex- 701.7 717.2 733.I 750 767.9 pressed . . Tons of water 622 622 622 622 622 evaporated Tons of 1st Mas- 79.7 95.2 III•I 128 145.9 secuite Tons sugar of all 62.2 74.3 86.7 too 114.0 classes recovered See also:Total output of 6220 7430 867o 10,000 11,400 sugar in 100 days. Tons Total value of all £800 £912 sugars per day at £8 per ton . £497, 6/–£594, 4/–£693, 6/– Less factory ex- £300 £30o penses per day . £300 £300 £300 Leaves for canes £500 £612 crushed . . . £197, 6/–£294, 4/–£393, 6/– Real value of See also:lot– II/Hi canes per ton . 4/24 6/2 8/– A value 6/8 7/94 8/to; 10/- II/I4 seeparent preceding Table) But it is obvious that it would not pay a planter to sell canes at 4s. 24d. a ton instead of at 1os. a ton, any more than it would pay a factory to make only 62.2 tons of sugar in 24 hours, or 6220 tons in the crop of too days, instead of 10,000 tons. Hence arises the imperative See also:necessity of good cultivation by the planter, and of circumspection in the See also:purchase and See also:acceptance of canes on the part of the manufacturer. The details of manufacture of sugar from canes and of sugar from beetroots differ, but there are five operations in the production of the sugar of See also:commerce from either material which are See also:common to both processes. These are: I. The extraction of the juice. 2. The See also:purification or defecation of the juice. 3. The evaporation of the juice to See also:syrup point. 4. The concentration and See also:crystallization of the syrup. 5. The curing or preparation of the crystals for the market by separating the See also:molasses from them. Extraction of Juice.—The juice is extracted from canes by squeezing them between rollers. In India at the See also:present day there are See also:thou-sands of small See also:mills worked by See also:hand, through which ExtracK/on the See also:peasant cultivators pass their canes two or three by Pressure. at a time, squeezing them a little, and extracting per- haps a See also:fourth of their weight in juice, from which they make a substance resembling a dirty sweetmeat rather than sugar. In Barbadoes there are still many estates making good Mascabado sugar; but as the juice is extracted from the canes by windmills, and then concentrated in open kettles heated by See also:direct See also:fire, the See also:financial results are disastrous, since nearly See also:half the yield obtainable from the canes is lost. In the best organized See also:modern cane sugar estates as much as 121% of the weight of the canes treated is obtained in crystal sugar of high polarizing power, although in See also:Louisiana, where cultivation and manufacture are alike most carefully and admirably carried out, the yield in sugar is only about 7% of the weight of the canes, and sometimes, but seldom, as much as 9%. This is due to conditions of See also:climate, which are much less favourable for the formation of saccharine in the canes than in Cuba. The See also:protection afforded to the planters by their See also:government, however, enables them to pursue the See also:industry with considerable profit, notwithstanding the poor return for their labour in saleable produce. As an instance of the See also:influence of See also:climatic conditions combined with high cultivation the cane lands of the See also:Sandwich Islands may be cited. Here the tropical See also:heat is tempered by See also:constant See also:trade winds, there is perfect See also:immunity from hurricanes, the See also:soil is peculiarly suited for cane-growing, and by the use of specially prepared fertilizers and an ample supply of water at command for See also:irrigation the See also:land yields from 50 to 90 tons of canes per See also:acre, from which from 12 to 14% of sugar is produced. To secure this marvellous return, with an annual rainfall of 26 in., as much as 52,000,000 gallons of water are pumped per 24 hours from artesian See also:wells on one See also:estate alone. With an inexhaustible supply of irrigation water obtainable, there is no See also:reason why the lands in Upper Egypt, if scientifically cultivated and managed, should not yield as abundantly as those in the Sandwich Islands. In the See also:Paris See also:Exhibition of 1900 a cape-crushing See also: b. Canes vary very much in respect of the quality and also as to the quantity of the juice they contain. The quantity of the juice is the test to which recourse must be had in judging the efficiency of the extraction, while the quality is the See also:main See also:factor to be taken into See also:account with regard to the results of subsequent manufacture. For the application of the foregoing considerations to practice, the subjoined table has been prepared. It shows the greatest quantity of juice that may be expressed from canes, according to the different proportions of fibre they contain, but without employing maceration or imbibition, to which processes reference is made hereafter. The percentages are percentages of the See also:original weight of the uncrushed canes. Per Per Per Per Per Per Cent. Cent. Cent. Cent. Cent. Cent. Percentage of fibre to II 12 13 14 15 in canes . . . Percentage of juice 90 89 88 87 86 85 in canes . . . Percentage of juice 10 II 12 13 14 15 retained in me- gass . . . . Percentage of maxi- 8o 78 76 74 72 70 mum expression. Percentage of best 79 76.9 74.9 72.9 70.6 68.5 average expres- See also:sion, in practice. Percentage of juice It 12.1 13.2 14.3 15.4 16.5 See also:left in megass, in practice . The British Guiana Planters' Association appointed a sub-See also:committee to See also:report to the West India See also:Commission on the manufacture of sugar, who stated the following: With canes containing 12% fibre the following percentages of sugar are extracted from the canes in the See also:form of juice: Single crushing 76% Double crushing 85% Double crushing with 12 % dilution 88 % Triple crushing with to % dilution 90 % See also:Diffusion with 25% dilution 94% These results are equivalent to 66.88 % extraction for single crushing. 74'80% „ ,, double crushing. 77'44% „ ,, double crushing with 12% dilution. 79.20% ,, triple „ to%
82.72 % ,. „ diffusion with 205%
To prevent the serious loss of juice left in the megass by even the best double and triple crushing, maceration or imbibition was introduced. The megass coming from the first mill MaceratMn was saturated with See also:steam and water, in weight equal or lmhibito between 20% and 3o% and up to 40 % of the original t/on.
weight of the uncrushed canes. Consequently, after
the last crushing the mixture retained by the residual megass was not juice, as was the case when crushing was employed without maceration, but juice mixed with water; and it was found that the loss in juice was reduced by one-half. A further saving of juice was sometimes possible if the market prices of sugar were such as to compensate for the cost of evaporating an increased quantity of added water, but a limit was imposed by the fact that water might be used in excess. Hence in the latest designs for large factories it has been proposed that as much normal juice as can be extracted by double crushing only shall be treated by itself, and that the megass shall then be soused with twice as much water as there is juice remaining in it; after which, on being subjected to a third crushing,-it will yield a degraded juice, which would also be treated by itself. It is found that in reducing the juice of these two qualities to syrup, See also:fit to pass to the vacuum pans for cooking to crystals, the total amount of evaporation from the degraded juice is about half that required from the normal juice produced by double crushing.
Great improvements have been made in the means of feeding the mills with canes by doing away with hand labour and substituting See also:mechanical feeders or rakes, which by means of a mechanical simple steam-driven mechanism will See also:rake the canes improve-
from the cane wagons on to the cane-See also:carriers. By menta. the See also:adoption of this system in one large plantation
in the West Indies, cru§See also: These attachments, first invented by See also:Jeremiah See also:Howard, and described in the United States Patent See also:Journal in 1858, are simply hydraulic rams fitted into the See also:side or top caps of the mill, and pressing against the side or top See also:brasses in. such a manner as to allow the side or top roll to move away from the other rolls, while an See also:accumulator, weighted to any desired extent, keeps a constant pressure on each of the rams. An objection to the top cap arrangement is, that if the See also:volume or feed is large enough to lift the top roll from the cane roll, it will simultaneously lift it from the megass roll, so that the megass will not be as well pressed as it ought to be; and an objection to the side cap arrangement on the megass roll as well as to the top cap arrangement is, that in case more canes are fed in at one end of the rolls than at the other, the roll will be pushed out farther at one end than at the other; and though it may thus avoid a breakdown of the rolls, it is See also:apt, in so doing, to break the ends off the See also:teeth of the See also:crown wheels by putting them out of See also:line with one another. The toggle-See also:joint See also:attachment, which is an extremely ingenious way of attaining the same end as the hydraulic attachments, is open to the same objections. extraction of cane juice by diffusion (a See also:process more fully de-scribed under the See also:head of beetroot sugar manufacture) is adopted in a few plantations in Java and Cuba, in Louisiana Extraction and the Hawaiian Islands, and in one or two factories'''' a in Egypt; but hitherto, except under exceptional by Diffusion. conditions (as at Aska, in the See also:Madras See also:Presidency, where the See also:local See also:price for sugar is three or four times the See also:London price), it would not seem to offer any substantial See also:advantage over double or triple crushing. With the latter system practically as much sugar is obtained from the canes as by diffusion, and the resulting megass furnishes, in a well-appointed factory, sufficient See also:fuel for the crop. With diffusion, however, in addition to the strict scientific See also:control necessary to secure the benefits of the process, fuel—that is, See also:coal or See also:wood—has to be provided for the working off of the crop, since the spent chips or slices from the diffusers are useless for this purpose; although it is true that in some plantations the spent chips have to a certain extent been utilized as fuel by mixing them with a portion of the molasses, which otherwise would have been sold or converted into See also:rum. The best results from extraction by diffusion have been obtained in Java, where there is an abundance of clear, good water; but in the Hawaiian Islands, and in Cuba and Demerara, diffusion has been abandoned on several well mounted estates and replaced by double and triple crushing; and it is not likely to be resorted to again, as the extra cost of working is not compensated by the slight increase of sugar produced. In Louisiana diffusion is successfully worked on two or three large estates; but the general See also:body of planters are shy of using it, although there is no lack of water, the See also:Mississippi being near at hand. Purification.—The second operation is the coagulation of the albumen, and the separation of it with other impurities from the juice which holds them in suspension or solution. The moment the juice is expelled from the cells of the canes chemical See also:inversion commences, and the sooner it is stopped the better. This is effected by the addition of See also:lime to neutralize the See also:free See also:acid. As See also:cold juice has a greater See also:affinity for lime than hot juice, it is best to treat the juice with lime when cold. This is easily done in liming or measuring tanks of known capacity, into which the juice is run from the mill. The requisite amount of See also:milk of lime set up at 10° Beaume is then added. Cream of lime of 17° Beaume is sometimes used, but the weaker solution is preferable, since the proper proportion is more easily adjusted. In Demerara and other places the juice is then heated under pressure up to 220° F. to 250° F. for a few moments, on its way to a steam and juice separator, where the steam due to the superheated juice flashes off, and is either utilized for aiding subsiding the steam supplied to the multiple effect evaporators, Tan or for See also:heating cold juice on its way to the main heater, ks. or it is allowed to See also:escape into the See also:atmosphere. The boiling juice is run down into subsiding tanks, where it cools, and at the same time the albumen, which has been suddenly coagulated by momentary exposure to high temperature, falls to the bottom of the tank, carrying with it the vegetable and other matters which were in suspension in the juice. After reposing some time, the clear juice is carefully decanted by means of a See also:pipe fixed by a swivel joint to an outlet in the bottom of the tank, the upper end of the pipe being always kept at the surface of the liquor by a See also:float attached to it. Thus clear liquor alone is run off, and the mud and cloudy liquor at the bottom of the tank are left undisturbed, and discharged separately as required. In Australia a continuous juice separator is generally used, and preferred to See also:ordinary subsiding or filtering tanks. It is a cylin-Continuous drical See also:vessel about 6 ft. deep, fitted with a conical /See also:aloe bottom of about the same See also:depth. Such a vessel is Separator. conveniently made of a diameter which will give the cylindrical portion sufficient capacity to hold the juice expressed from the cane-mill in one See also:hour. The hot liquor is con-ducted downwards" in a continuous steady stream by a central pipe to eight See also:horizontal branches, from which it issues into the separator at the level of the junction of the cylindrical and conical portions of the vessel. Since the specific gravity of hot liquor is less than that of cold liquor and since the specific gravity of the scum and particles of solid matter in suspension varies so slightly with. the temperature that practically it remains constant, the hot liquor rises to the top of the vessel, and the scums and particles of solid matter in suspension See also:separate themselves from it and fall to the bottom. By the mode of See also:admission the hot liquor at its entry is distributed over a large See also:area relatively to its volume, and while this is necessarily effected with but little disturbance to the contents of the vessel, a very slow velocity is ensured for the current of ascending juice. In a continuous separator of which the cylindrical portion See also:measures 13 ft. in diameter and 6 ft. deep (a suitable See also:size for treating a juice supply of 4000 to 4500 gallons per hour), the upward current will have a velocity of about i See also:inch per minute, and it is found that all the impurities have thus ample time to separate themselves. The clear juice when it arrives at the top of the separator flows slowly over the level edges of ,a See also:cross See also:canal and passes in a continuous stream to the service tanks of the evaporators or vacuum See also:pan. The sloping sides of the conical bottom can be freed from the coating of scum which forms upon them every two or three hours by two rotatory scrapers, formed of L-irons, which can be slowly turned by an attendant by means of a central See also:shaft provided with a suitable handle. The scums then See also:settle down to the bottom of the See also:cone, whence they are run off to the scum tank. Every twenty-four hours or so the flow of juice may be conveniently stopped, and, after all the impurities have subsided, the superincumbent clear liquor may be decanted by a See also:cock placed, at the side of the cone for the purpose, and the vessel may be washed out. These separators are carefully protected by non-conducting See also:cement and wood lagging, and are closed at the top to prevent loss of heat ; and they will run for many hours without requiring to be changed, the duration of the run depending on the quality of the liquor treated and amount of impurities therein. Smaller separators of the same construction are used for the treatment of syrup. In Cuba, Martinique, Peru and elsewhere the old-fashioned double-bottomed defecator is used, into which the juice is run Double- direct, and there limed and heated. This defecator is Dobouble made with a hemispherical See also:copper bottom, placed in bottomed an See also:outer See also:cast-See also:iron casing, which forms a steam jacket, Defecators. and is fitted with a cylindrical curb or See also:breast above the bottom. If double-bottomed defecators are used in sufficient number to allow an hour and a half to two hours for making each defecation, and if they are of a size which permits any one of them to be filled up by the cane-mill with juice in ten to twelve minutes, they will make as perfect a defecation as is obtainable by any known system; but their employment involves the expenditure of much high-pressure steam (as exhaust steam will not heat the juice quickly enough through the small surface of the hemispherical inner bottom), and also the use of See also:filter presses for treating the scums. A great See also:deal of skilled superintendence is also required, and first cost is comparatively large. When a sufficient number are not available for a two hours' defecation, it is the practice in some factories toskim off the scums that rise to the top, and then See also:boil up the juice for a few minutes and skim again, and, after repeating the operation once or twice, to run off the juice to separators or subsiders of any of the kinds previously described. In Java and See also:Mauritius, where very clean canes are grown, double-bottomed defecators are generally used, and to them, perhaps as much as to the quality of the canes, may be attributed the very strong, See also:fine sugars made in those islands. They are also employed in Egypt, being remnants of the plant used in the. days when the juice passed through See also:bone-See also:black before going to the evaporators. A modification of the system of double-bottom defecators has lately been introduced with considerable success in See also:San Domingo and in. Cpba, by which a continuous and steady See also:discharge Contlauous of clear defecated juice is obtained on the one hand, and Defecaton. on the other a comparatively hard dry cake of scum or cachaza, and without the use of filter presses. These results are brought about by adding to the cold juice as it comes from the mill the proper proportion of milk of lime set up at 8° B., and then delivering the limed juice in a constant steady stream as near the bottom of the defecator as possible; it is thus brought into immediate contact with the heating surface and heated once for all before it ascends, with the result of avoiding the disturbance caused in the ordinary defecator by pouring cold juice from above on to the surface of the heated juice, and so establishing down-currents of cold juice and up-currents of hot juice. In the centre of the defecator an open-topped cylindrical vessel is placed, with its bottom about 6 in. above the bottom of the defecator and its top about 12 in. below the top of the defecator. In this vessel is placed the See also:short See also:leg of a draw-off See also:siphon, reaching to nearly the bottom. The action of the moderate heat, 2 1o° F., on the limed juice causes the albumen in it to coagulate; this rising to the surface collects the cachazas, which form and float thereon. The clear juice in the meantime flows over the edge of the cylindrical vessel without disturbance and finds its way out by the short leg of the siphon, and so passes to the canal for See also:collecting the defecated juice. The admission of steam must be regulated with the greatest nicety, so as to maintain an equable temperature, 208° to 210° F., hot enough to See also:act upon the albumen and yet not enough to cause ebullition or disturbance in the juice, and so prevent a proper separation of the cachazas. This is attained by the aid of a copper pipe, 4 in. in diameter, which follows the See also:curve of the hemispherical bottom, and is fitted from one side to the other of the defecator;, one end is entirely closed, and the other is connected by a small pipe to a shallow circular vessel outside the defecator, covered with an india-See also:rubber See also:diaphragm, to the centre of which is attached a See also:light See also:rod actuating a steam throttle-See also:valve, and capable of being adjusted as to length, &c. The copper pipe and circular vessel are filled with cold water, which on becoming heated by the surrounding juice expands, and so forces up the india-rubber diaphragm and shuts off the steam. By adjusting the length of the connecting rod and the amount of water. in the vessel, the amount of steam admitted can be regulated to a nicety. To make this apparatus more perfectly automatic, an arrangement for continually adding to and mixing with the juice the proper proportion of milk of lime has been adapted to it; and although it may be objected that once the proportion has been determined no See also:allowance is made for the variation in the quality of the juice coming from the mill owing to the See also:variations that may occur in the canes fed into the mills, it is obviously as easy to vary the proportion with the automatic arrangement from time to time as it is to vary in each separate direction, if the See also:man in See also:charge will take the trouble to do so,' which he very seldom does with the ordinary defecators, satisfying himself with testing the juice once or twice in a See also:watch. The scums forming on the top of the continuous defecator become so hard and dry that they have to be removed from time to time with a specially constructed See also:instrument like a See also:flat See also:spade with three flat prongs in front. These scums are not worth passing through the filter presses, and are sent to the fields direct as manure. The scums separated from the juice by ordinary defecation entangle and carry away with them a certain amount of the juice with its contained saccharine. In some factories they Treatment are collected in suitable tanks, and steam is blown into T eat them, which further coagulates the albuminous See also:par- ticles. Scums. These in their upward passage to the top, S where they float, free themselves from the juice, which they leave below them comparatively clear. The juice is then drawn off and pumped up to one of the double-bottomed defecators and redefecated, or, where juice-heaters have" been used instead of defecators, the scums from the separators or subsiders are heated and forced through filter presses, the juice expressed going to the evaporators and the scum cakes formed in the filter presses to the fields as manure. In diffusion plants the milk of lime is added, in proper proportion, in the cells of the diffusion See also:battery, and the chips or slices themselves act as a mechanical filter for the juice; while in the Sandwich Islands See also:coral-See also:sand filters have been employed for some years, in addition to the chips, to free the juice from impurities held in mechanical suspension. In See also:Germany very similar filters have also been used, See also:pearl-See also:quartz See also:gravel taking the See also:place of coral sand, which it closely resembles. In Mexico filters filled with dry powdered megass have been found very efficient for removing the large quantity of impurities contained in the juice expressed from the very vigorous but See also:rank canes grown in that wonderfully fertile country, but unless constant care is taken in managing them, and in changing them at the proper time, there is great See also:risk of inversion taking place, with consequent loss of sugar. After the juice has been defecated or purified by any of the means above mentioned it is sent to the evaporating apparatus, hereinafter described, where it is concentrated to 26° or 28° Beaume, and is then conducted in a continuous stream either into the service tanks of the vacuum pan, if dark sugars are required, or, if a better colour is wanted, into clarifiers. The latter are circular or rectangular vessels, holding from 500 to 1500 gallons each, according to the capacity of the factory, and fitted with steam coils at the bottom and skimming troughs at the top. In them the syrup is quickly brought up to the boil and skimmed for about five minutes, when it is run off to the service tanks of the vacuum pans. The heat at which the syrup boils in the clarifiers, 220° F., has the See also:property of separating a great deal of the See also:gum still remaining in it, and thus cleansing the solution of sugar and water for crystallization in the vacuum pans; and if after skimming the syrup is run into separators or subsiders of any description, and allowed to .settle down and cool before being drawn into the vacuum pan for crystallization, this cleansing process will be more thorough and the quality of the final product will be improved. Whether the improvement will be profitable or not to the planter or manufacturer depends on the market for the sugar, and on the conditions of foreign tariffs, which are not infrequently hostile. Evaporation of the Juice to Syrup.—The third operation is the concentration of the approximately pure, but thin and watery, juice to syrup point, by See also:driving off a portion of the water in vapour through some system of heating and evaporation. Since on an average 70% by measurement of the normal defecated cane juice has to be evaporated in order to reduce it to syrup ready for final concentration and crystallization in the vacuum pan, and since to attain the same end as much as 90 to 95% of the volume of mixed juices has to be evaporated when maceration or imbibition is employed, it is clear that some more economical mode of evaporation is necessary in large estates than the open-fire batteries still common in See also:Barbados and some of the West Indian islands, and in small haciendas in Central See also:America and Brazil, but seldom seen elsewhere. With open-fire batteries for making the syrup, which was afterwards finished in the vacuum pan, very good sugar was produced, but at a cost that would be ruinous in to-day's markets. In the best days of the so-called See also:Jamaica Trains in Demerara, three-quarters of a ton of coal in addition to the megass was burned per ton of sugar made, and with this for many years planters were content, because they pointed to the fact that in the central factories, then working in Martinique and Guadeloupe, with See also:charcoal filters and triple-effect evaporation, 750 kilos of coal in addition to the megass were consumed to make moo kilos of sugar. All this has flow been changed. It is unquestionably better and easier to evaporate in vacuo than in an open pan, and with a better system of firing, a more liberal See also:provision of steam generators, and multiple-effect evaporators of improved construction, a far larger yield of sugar is obtained from the juice than was possible of attainment in those days, and the megass often suffices as fuel for the crop.
The multiple-effect evaporator, originally invented and constructed by Norberto Rilleux in New See also: In places where work is carried on day and See also:night throughout the See also:week, the standard type of evaporator lends itself more readily to cleaning operations than any other. It is obviously easier to See also:brush out and clean vertical tubes open at both ends, - and about 6 ft. long, on which the scale has already been loosened by the aid of boiling with dilute muriatic acid or a weak solution of See also:caustic soda in water, than it is to clean either the inside or the outside of horizontal tunes more than double the length. This See also:consideration should be carefully remembered in the future by the planter who may require an evaporator and by the engineer who may be called upon to design or construct it, and more especially by a constructor without See also:practical experience of the working of his constructions. Concentration and Crystallization.—The defecated cane juice, having lost about 70% of its bulk by evaporation in the multiple-effect evaporator, is now syrup, and ready to enter the Howard's vacuum pan for further concentration and crystalliza- 0w rd tion. In a patent (No. 3607, 1812) granted to E. C. Pan' Howard it is stated, among other things, that " water dissolves the most uncrystallizable in preference to that which is most crystallizable sugar," and the patentee speaks of " a See also:discovery I have made that no solution, unless highly concentrated, of sugar in water can without material injury to its colouring and crystallizing power, or to both, be exposed to its boiling temperature during the See also:period required to evaporate such solution to the crystallizing point." He stated that " he had made a magma of sugar and water at atmospheric temperature, and heated the same to 190° or 200 F. in a water or steam See also:bath, and then added more sugar or a thinner magma, and the whole being then in a See also:state of imperfect fluidity, but so as to See also:close readily behind the stirrer, was filled into moulds and purged " (drained). I do further declare," he added, "that although in the application of heat to the refining of sugar in my said invention or process I have stated and mentioned the temperature of about 200 F. scale as the heat most proper to be used and applied in order to secure and preserve the colour and crystallizability of the sugars, and most easily to be obtained with precision and uniformity by means of the water bath and steam bath, yet when circumstances or choice may render the same desirable I do make use of higher temperatures, although less beneficial." Howard at any See also:rate saw clearly what was one of the indispensable requisites for theeconomical manufacture of fine crystal sugar of good colour -.the treatment of saccharine solutions at temperatures very considerably See also:lower than 212° F., which is the temperature of water boiling at normal atmospheric pressure. Nor was he long in providing means for securing these lower temperatures. His patent (No. 3754 of 1813) describes the closed vacuum pan and the See also:air See also:pump with See also:condenser for steam by injection, the use of a thermometer immersed in the solution in the pan, and a method of ascertaining the density of the solution with a See also:proof stick, and by observations of the temperature at which, while fluid and not containing See also:grain, it could be kept boiling under different pressures shown by a vacuum See also:gauge. "A table is also given of boiling points from 115° F. to 175° F., corresponding to decimal parts of an inch of See also:mercury of the vacuum gauge. Since Howard published his invention the vacuum pan has been greatly improved and altered in shape and power, and especially of See also:recent years, and the advantages of concentrating in vacuo having been acknowledged, the system has been adopted in many other industries, and crowds of inventors have turned their See also:attention to the principle. In endeavouring to make a pan of less power do as much and as good work as one of greater power, they have imagined many ingenious mechanical contrivances, such as currents produced mechanically to promote evaporation and crystallization, feeding the pan from many points in order to spread the feed equally throughout the See also:mass of sugar being cooked, and so on. All their endeavours have obtained at best but a doubtful success, for they have overlooked the- fact that to evaporate a given weight of water from the syrup in a vacuum pan at least an equal weight (or in practice about 15% more) of steam must be condensed, and the first cost of mechanical See also:agitators, together with the expenditure they involve for See also:motive power and See also:maintenance, must be put against the slight saving in the heating surface effected by their employment. On the other hand, the See also:advocates of admitting the feed into a vacuum pan in many minute streams See also:appeal rather to the ignorant and incompetent sugar-See also:boiler than to a man who, knowing his business thoroughly, will boil 15o tons of hot raw sugar in a pan in a few hours, feeding it through a single pipe and valve to in. in diameter. Nevertheless, it has been found in practice, when syrups with See also:low quotient of purity and high quotient of impurity are being treated, injecting the feed at a number of different points in the pan does reduce the time required to boil the pan, though of no practical advantage with syrups of high quotient of purity and free from the viscosity which impedes circulation and therefore See also:quick boiling. See also:Watt, when he invented the steam engine, laid down the principles on which it is based, and they hold good to the present day. So also the principles laid down by Howard with respect to the vacuum pan hold rod to-day: larger pans have been made and their heating surface has been increased, but it has been found by practice now, as it was found then, that an ordinary See also:worm or coil 4 in. in diameter and 50 ft. long will be far more efficient per square foot of surface than a similar coil too ft. long. Thus the most efficient vacuum pans of the present day are those which have their coils so arranged that no portion of them exceeds 5o or 6o ft. in length; with such coils, and a sufficient See also:annular space in the pan free from obstruction, in order to allow a natural down-current of the cooking mass, while an up-current all See also:round is also naturally produced by the action of the heated See also:worms or coils, rapid evaporation and crystallization can be obtained, without any mechanical adjuncts to require attention or afford excuse for See also:negligence. The choice of the size of the crystals to be produced in a given pan depends upon the market for which they are intended. It is of course presupposed that the juice has been properly defecated, because without this no amount of skill and knowledge in cooking in the pan will avail; the sugar resulting must be bad, either in colour or grain, or both, and certainly in polarizing power. If a very large See also:firm grain like sugar-candy is required the syrup when first brought into the pan must be of low density, say 2o° to 21 ° Beaume, but if a smaller grain be wanted it can easily be obtained from syrup of 27° to 28° Beaume. On some plantations making sugar for particular markets and use in refineries it is the See also:custom to make only one class of sugar, by boiling the molasses produced by the purging of one strike with the sugar in the next strike. On other estates the second sugars, or sugars produced from boiling molasses alone, are not purged to dryness, but when sufficiently separated from their See also:mother-liquor are mixed with the defecated juice, thereby increasing its saccharine richness, and after being converted into syrup in the usual manner are treated in the vacuum pan as first sugars, which in fact they really are. In certain districts, notably in the Straits Settlements, syrup is prepared as described above for crystallization in a vacuum pan, but instead of being cooked in vacuo it is slowly boiled up in open double-bottom pans. These pans are sometimes heated by boiling oil, with the idea that under such conditions the sugar which is kept stirred all the time as it thickens cannot be burnt or caramelized; but the same object can be attained more economically with steam of a given pressure by utilizing its latent heat. The sugar thus produced, by constant stirring and evaporation almost to dryness, forms a See also:species of small-grained See also:concrete. It is called " See also:basket sugar," and meets with a brisk See also:sale, at remunerative prices, among the See also:Chinese coolies; and as the sugar as soon as cooled is packed ready for market, without losing any weight See also:lay draining, this See also:branch of sugar-making is a most lucrative one where-ever there is sufficient local demand. Very similar kinds of sugar are also produced for local See also:consumption in Central America and in Mexico, under the names of " Panela " and " Chancaca," but in those countries the sugar is generally boiled in pans placed over See also:special fire-places, and the factories making it are on a comparatively small scale, whereas in the Straits Settlements the " basket sugar " factories are of considerable importance, and are fitted with the most approved machinery. Curing or Preparation of Crystals for the Market.—The crystallized sugar from the vacuum pan has now to be separated from the molasses or mother-liquor surrounding the crystals. In some parts of Mexico and Central America this separation is still effected by running the sugar into conical moulds, and placing on the top a layer of moist See also:clay or See also:earth which has been kneaded in a mill into a stiff See also:paste. The moisture from the clay, percolating through the mass of sugar, washes away the adhering molasses and leaves the crystals comparatively free and clear. It may be noted that sugar that will not purge easily and freely with clay will not purge easily and freely in centrifugals. But for all practical purposes the system of claying sugar is a thing of the past, and the bulk of the sugar of commerce is now purged in centrifugals, as indeed it has been for many years. The reason is obvious. The claying system involved the expense of large curing houses and the employment of many hands, and See also:forty days at least were required for completing the operation and making the sugar fit for the market, whereas with centrifugals sugar cooked to-day can go to market to-morrow, and the labour employed is reduced to a minimum. When Cuba was the See also:chief sugar-producing country making clayed sugars it was the custom (followed in refineries and found advantageous in general practice) to discharge the strike of crystallized sugar from the vacuum pan into a See also:receiver heated below by steam, and to stir the mass for a certain time, and then distribute it into the moulds in which it was afterwards clayed. When centrifugals were adopted for purging the whole crop (they had long been used for curing the second or third sugars), the system then obtaining of running the sugar into wagons or coolers, which was necessary for the second and third sugars cooked only to See also:string point, was continued, but latterly " crystallization in See also:movement," a development of the system which forty years ago or more existed in refineries and in Cuba, has come into general use, and with great advantage, especially where proprietors have been able to erect appropriate buildings and machinery for carrying out the system efficiently. The vacuum pan is erected at a height which commands the crystallizers, each of which will, as in days gone by in Cuba, hold the con-tents of the pan, and these in their turn are set high enough to allow the charge to fall into the feeding-trough of the centrifugals, thus obviating the necessity of any labour to remove the raw sugar from the time it leaves the vacuum pan to the time it falls into the centrifugals. For this reason alone, and without taking into consideration any increase in the yield of sugar brought about by " crystallization in movement," the system is worthy of adoption in all sugar factories making crystal sugar. The crystallizers are long, horizontal, cylindrical or semi-cylindrical vessels, fitted with a strong horizontal shaft running from end to end, which is kept slowly revolving. The shaft Crystal - carries arms and See also:blades fixed in such a manner that fixers. the mass of sugar is quietly but thoroughly moved, while at the same time a See also:gentle but sustained evaporation is produced by the continuous exposure of successive portions of the mass to the action of the atmosphere. Thus also the crystals already formed come in contact with fresh mother-liquor, and so go on adding to their size. Some crystallizers are made entirely cylindrical, and are connected to the condenser of the vacuum pan; in order to maintain a partial vacuum in them, some are fitted with cold-water pipes to cool them and with steam pipes to heat them, and some are left open to the atmosphere at the top. But the efficiency of all depends on the process of almost imperceptible yet continuous evaporation and the methodical addition of syrup, and not on the idiosyncrasies of the experts who See also:manage them; and there is no doubt that in large commercial processes of manufacture the simpler the apparatus used for obtaining a desired result, and the more easily it is understood, the better it will be for the manufacturer. The sugar made from the first syrups does not require a crystallizer in movement to prepare it for purging in the centrifugals, but it is convenient to run the strike into the crystallizer and so empty the pan at once and leave it ready to commence another strike, while the second sugars will be better for twenty-four hours' stirring and the third sugars for forty-eight hours' stirring before going to the centrifugals. To drive these See also:machines See also:electricity has been applied, with indifferent success, but they have been very efficiently driven, each independently of the others in the set, by means of a modification of a Pelton See also:wheel, supplied with water under pressure from a pumping engine. A comparatively small stream strikes the wheel with a pressure equivalent to a great head, say 300 ft., and as the quantity of water and number of jets striking the wheel can be regulated with the greatest ease and nicety, each See also:machine can without danger be quickly brought up to its full See also:speed when purging high-class sugars, or allowed to run slowly when purging low-class sugars, until the heavy, gummy molasses have been expelled; and it can then be brought up to its full speed for finally drying the sugar in the basket, a boon which all practical sugar-makers will appreciate. The water forced by the force-pump against the Pelton wheels returns by a See also:waste-pipe to the tank, from which the force-pump takes it again. Recent Progress.—The manufacture of cane sugar has largely increased in volume since the year 1901–1902. This, apart from the effect of the abolition of the sugar bounties, has been mainly the result of the increased employment of improved processes, carried on in improved apparatus, under skilled supervision, and with due regard to the importance of the chemical aspects of the work. Numerous central factories have been erected in several countries with plant of large capacity, and many of them work day and night for six days in the week. There were 173 of these central factories working in Cuba in 1908-1909, among which Factories. the "Chaparra," in the See also:province of See also:Oriente, turned out upwards of 69,000 tons of sugar in the crop of about 20 weeks, and the " See also:Boston " had an output of about 61,000 tons in the same time. Of the 178 factories at work in Java in 1908–1909, nearly all had most efficient plant for treating the excellent canes grown in that favoured See also:island. (See Jaarboek voor suikerfabrikanten op Java, 13°Jaargang 1908–1909, pp. 22–61 Amster-See also:dam, J. H. de See also:Bussy.) The severance of the agricultural work, i.e. cane-growing, from the manufacturing work, sugar-making, must obviously conduce to better and more profitable work of both kinds. The use of multiple-effect evaporation made it possible to raise the steam for all the work required to be done in a well-equipped Often factory, making crystals, under skilful management, Oftensena by means of the bagasse alone proceeding from the Fuel. canes ground, without the aid of other fuel. The bagasse so used is now commonly taken straight from the cane mill to furnaces specially designed for burning it, in its moist state and without previous drying, and delivering the hot gases from it to suitable boilers, such as those of the multitubular type or of the water-See also:tube type. The value of fresh bagasse, or as it is often called " See also:green " bagasse, as fuel varies with the See also:kind of canes from which it comes, with their treatment in the mill, and with the skill used in firing; but it may be stated broadly that 1 lb of fresh bagasse will produce from 1; lb to 21 lb of steam, according to the conditions. The use of preparing rolls with corrugations, to crush and equalize the feed of canes to the mill, or to the first of a series of mills, has Extraction become general. The Krajewski crusher has two such See also:Wake. See also:steel rolls, with V-shaped corrugations extending longi- tudinally across them. These rolls run at a speed about 30 % greater than the speed of the first mill, to which they deliver the canes well crushed and flattened, forming a close See also:mat of pieces of cane 5 to 6 in. long, so that the subsequent grinding can be carried on without the stoppages occasioned by the mill choking with a heavy and irregular feed. The crusher is preferably driven by an See also:independent engine, but with suitable gearing it can be driven by the mill engine. The Krajewski crusher was invented some years ago by a See also:Polish engineer See also:resident in Cuba, who took out a patent for it and gave it his name. The patent has expired. The increase in the output for a given time obtained by the use of the Krajewski crusher has been estimated at 20 to 25 % and varies with the quality of the canes; while the yield of juice or extraction is increased by 1 or 2%. The process of continuous defecation which was introduced into Cuba from Santo Domingo about 1900 had by 1910 borne the ~~~~ test of some ten years' use with notable success. The See also:Eton. See also:Hatton defecator, which is employed for working it, has been already described, but it may be mentioned that the regulation of the admission of steam is now simplified and secured by a patent thermostat—a selt-acting apparatus in which the unequal expansion of different metals by heat actuates, through compressed air, a diaphragm which controls the steam step-valve—and by this means a constant temperature of 210° F. (98.8° C.) is maintained in the juice within the defecator during the whole time it is at work.
Earthy matter and other matter precipitated and fallen on the copper double bottom may be dislodged by a slowly revolving scraper—say every twelve hours—and ejected through the bottom discharge cock; and thus the heating surface of the copper bottom will be kept in full efficiency. With ordinary care on the part of the men in charge Hatton defecators will work continuously for several days and nights, and the number required to deal with a given volume of juice is half the number of ordinary defecators of equal capacity which would do the same work; for it must be borne in mind that an ordinary double-bottomed defecator takes two hours to deliver its charge and be in readiness to receive a fresh charge, i.e. 20 minutes for filling and washing out after emptying; 6o minutes for heating up and subsiding; and 40 minutes for See also:drawing off the defecated juice, without agitating it. Apart from increased yield in sugar of good quality, we may sum up the advantages procurable from the use of Hatton defecators as follows: cold liming; heating gently to the temperature required to coagulate the albumen and not beyond it, whereby disturbance would ensue; the continuous separation of the scums; the See also:gradual drying of the scums so as to make them ready for the fields, without carrying away juice or requiring treatment in filter presses; and the continuous supply of hot defecated juice to the evaporators, without the use of subsiding tanks or eliminators; and, finally, the saving in expenditure on plant, such as filter presses, &c., and See also:wages.
Beetroot Sugar Manufacture.—The sugar beet is a cultivated variety of Beta nzaritima (nat. ord. Chenopodiaceae), other varieties of which, under the name of mangold or mangel-wurzel, are grown as feeding roots for See also:cattle.
About 176o the See also:Berlin See also:apothecary Marggraff obtained in his laboratory, by means of See also:alcohol, 6.2% of sugar from a See also: The roots were grown under exactly the same cultivation and conditions as a crop of mangel-wurzel—that is to say, they had the ordinary cultivation and manuring of the usual root crops. The weight per acre, the saccharine contents of the juice, and the quotient of purity compared favourably with the best results obtained in Germany or France, and with those achieved by the See also:Suffolk farmers, who between 1868 and 1872 supplied Mr See also:Duncan's beetroot sugar factory at Lavenham; for the weight of their roots rarely reached 15 tons per acre, and the percentage of sugar in the juice appears to have varied between ro and 12. On the best-equipped and most skilfully managed cane sugar estates, where the climate is favourable for maturing the cane, a similar return is obtained. Therefore, roughly speaking, one ton of beetroot may be considered to-day as of the same value as one ton of canes; the value of the refuse chips in one case, as See also:food for cattle, being put against the value of the refuse bagasse, as fuel, in the other. Before beetroot had been brought to its present state of perfection, and while the factories fo: its manipulation were worked with hydraulic presses for squeezing the juice out of the pulp produced in the raperies, the cane sugar planter in the West Indies could easily hold his own, notwithstanding the artificial competition created and maintained by sugar bounties. But the degree of perfection attained in the cultivation of the roots and their subsequent manipulation entirely altered this situation and brought about the crisis in the sugar trade referred to in connexion with the bounties (see See also:History below) and dealt with in the See also:Brussels See also:convention of Igoe. In beetroot sugar manufacture the operations are washing, slicing, diffusing, saturating, sulphuring, evaporation, concentration and curing. Slicing.—The roots are brought from the fields by carts, canals and See also:railways. They are weighed and then dumped into a washing machine, consisting of a large horizontal cage, submerged in water, in which revolves a horizontal shaft carrying arms. The arms are set in a See also:spiral form, so that in revolving they not only stir the roots, causing them to rub against each other, but also force them forward from the receiving end:of the cage to the other end. Here they are discharged (washed and freed from any adherent soil) into an elevator, which carries them up to the top of the buildin and delivers them into a hopper feeding the slicer. Slicers use to be constructed with iron disks about 33 to 40 in. diameter, which were fitted with knives and made 140 to 150 revolutions per minute, under the hopper which received the roots. This hopper was divided into two parts by vertical See also:division plates, against the bottom edge of which the knives in the disk forced the roots and sliced and pulped them. Such machines were good enough when the juice was expelled from the small and, so to speak, chopped slices and pulp by means of hydraulic presses. But hydraulic presses have now been abandoned, for the juice is universally obtained by diffusion, and the small slicers have gone out of use, because the large amount of pulp they produced in proportion to slices is not suitable for the diffusion process, in which evenly cut slices are required, which present a much greater surface with far less resistance to the diffusion water. Instead of the small slicers, machines made on the same principle, but with disks 7 ft. and upwards in diameter, are used. Knives are arranged around their circumference in such a way that the hopper feeding them presents an annular opening to the disk, say 7 ft. outside diameter and 5 ft. inside, with the necessary division plates for the knives to cut against, and instead of making 140 to 150 revolutions the disks revolve only 6o to 7o times per minute. Such a slicer is capable of efficiently slicing 300,000 kilos of roots in twenty-four hours, the knives being changed four times in that period, or oftener if required, for it is necessary to See also:change them the moment the slices show by their rough See also:appearance that the knives are losing their cutting edges. Diffusion.—The diffusion cells are closed, vertical, cylindrical vessels, holding generally 6o hectolitres, or 1320 gallons, and are arranged in batteries of 12 to 14. Sometimes the cells are erected in a circle, so that the spout below the slicing machine revolving above them with a corresponding See also:radius can discharge the slices into the centre of any of the cells. In other factories the cells are arranged in lines and are charged from the slicer by suitable telescopic pipes or other convenient means. A circular disposition of the cells facilitates charging by the use of a pipe rotating above them, but it renders the disposal of the hot spent slices somewhat difficult and inconvenient. The erection of the cells in straight lines may cause some little complication in charging, but it allows the hot spent slices to be discharged upon a travelling See also:band which takes them to an elevator, an arrangement simpler than any which is practicable when the cells are disposed in a circle. Recently, however, a well-known sugar maker in Germany has altered his battery in such manner that instead of having to open a large See also:door below the cells in order to discharge them promptly, he opens a comparatively small valve and, applying compressed air at the top of the See also:cell, blows the whole contents of spent slices up a pipe to the drying apparatus, thus saving not only a great deal of time but also a great deal of labour of a kind which is both arduous and painful, especially during cold See also:weather. The slices so blown up, or elevated; are passed through a mill which expels the surplus water, and are then pressed into cakes and dried until they hold about 12 % of water and 88% of beet fibre. These cakes, sold as food for cattle, fetch as much as £4 per ton in See also:Rumania, where four or five beetroot factories are now at work. A cell when filled with fresh slices becomes the head of the battery, and where skilled scientific control can be relied upon to regulate the process, the best and most economical way of heating the slices, previous to admitting the hot liquor from the next cell, is by direct steam; but as the slightest inattention or carelessness in the admission of direct steam might have the effect of inverting sugar and thereby causing the loss of some portion of saccharine in the slices; water heaters are generally used, through which water is passed and heated up previous to admission to the freshly-filled cell. When once a cell is filled up and the slices are warmed through, the liquor from the adjoining cell, which hitherto has been running out of it to the saturators, is turned into the new cell, and beginning to displace the juice from the fresh slices, runs thence to the saturators. When the new cell comes into operation and becomes the head of the battery, the first or tail cell is thrown out, and number two be-comes the tail cell, and so the rounds are repeated; one cell is always being emptied and one filled or charged with slices and heated up, the latter becoming the head of the battery as soon as it is ready. Saturation.—The juice, previously treated with lime in the diffusion battery, flows thence into a saturator. This is a closed vessel, into which carbonic acid See also:gas (produced as described here-after) is forced, and combining with the lime in the juice forms carbonate of lime. The whole is then passed through filter presses, the clear juice being run off for further treatment, while the See also:carbon-See also:ate of lime is obtained in cakes which are taken to the fields as manure. The principal improvement made of recent years in this portion of the process has been the construction of pipes through which the carbonic acid gas is injected into the juice in such a manner that they can be easily withdrawn and a clean set substituted. The filter presses remain substantially unchanged, although many ingenious but slight alterations have been made in their details. The juice, which has now become comparatively clear, is again treated with lime, and again passed through a saturator and filter presses, and comes out still clearer than before. It is then treated with sulphurous acid gas, for the purpose of decolorization, again limed to neutralize the acid, and then passed through a third saturator wherein all traces of lime and See also:sulphur are removed. A process for purifying and decolorizing the juice expressed from beetroots by the addition of a small quantity of manganate of lime (2o to 5o grammes per hectolitre of juice), under the influence of an electric current, was worked with considerable success in a sugar factory in the See also:department of See also:Seine-et-See also:Marne in the year 1900-1901. A saving of 4o% is stated to be effected in lime. The use of sulphurous acid gas is entirely abandoned, and instead of three carbonatations with corresponding labour and plant only one is required. The coefficient of purity is increased and the viscosity of the juice diminished. The total saving effected is stated to be equivalent to 3 francs per ton of beetroot worked up. This system is also being tried on a small scale with sugar-cane juice in the West Indies. If by this process a more perfect defecation and purification of the juice is obtained, it will no doubt be highly beneficial to the cane planter, though no great economy in lime can be effected, because but very little is used in a cane factory in comparison with the amount used m a beet factory. Evaporation and Crystallization.—The clear juice thus obtained is evaporated in a multiple-effect evaporator and crystallized in a vacuum pan, and the sugar is purged in centrifugals. From the centrifugal the sugar is either turned out without washing as raw sugar, only fit for the refinery, or else it is well washed with a spray of water and air until white and dry, and it is then offered in the market as refined sugar, although it has never passed through See also:animal charcoal (bone-black). The processes of evaporation and concentration are carried on as they are in a cane sugar factory, but with this advantage, that the beet solutions are freer from gum and See also:glucose than those obtained from sugar-canes, and are therefore easier to See also:cook. Curing.—There are various systems of purging refined, or so-called refined, sugar in centrifugals, all designed with a view of obtaining the sugar in lumps or tablets, so as to appear as if it had been turned out from moulds and not from centrifugals, and greatingenuity and large sums of See also:money have been spent in perfecting these different systems, with more or less happy results. But the great achievement of recent manufacture is the production, without the use of animal charcoal, of a cheaper, but good and wholesome See also:article, in appearance equal to refined sugar for all intents and purposes, except for making preserves of fruits in the old-fashioned way. The wholesale jam manufacturers of the present day use this sugar; they boil the jam in vacuo and secure a product that will last a long time without deteriorating, but it lacks the delicacy and distinctive flavour of See also:fruit preserved by a careful housekeeper, who boils it in an open pan with cane sugar to a less density, though exposed for a short time to a greater heat.
Carbonatation.—The carbonic acid gas injected into the highly limed juice in the saturators is made by the calcination of See also:limestone in a See also:kiln provided with three cleaning doors, so arranged as to allow the lime to be removed simultaneously from them every six hours. The gas generated in the kiln is taken off at the top by a pipe to a gas-washer. In this it passes through four sheets of water, by which it is not only freed from any dust and dirt that may have come over with it from the kiln, but is also cooled to a temperature which permits an air-pump to withdraw the gas from the kiln, through the gas-washer, and force it into the saturators, without overheating. In some factories for refining sugar made from beet or canes this system of carbonatation is used, and enables the refiner to work with syrups distinctly alkaline and to economize a notable amount of animal charcoal.
Refining.—Briefly, sugar-refining consists of melting raw or unrefined sugar with water into a syrup of 27° to 28° Beaume, or 123o specific gravity, passing it through filtering See also:cloth to remove the sand and other matters in mechanical suspension, and then through animal charcoal to remove all traces of colouring matter and lime, thus producing a perfectly clear white syrup, which, cooked in the vacuum pan and crystallized, becomes the refined sugar of commerce.
Melting Pans.—The melting pans are generally circular vessels, fitted with a perforated false bottom, on which the sugar to be melted is dumped. The pans are provided with steam worms to keep the mass hot as required, and with mechanical stirrers to keep it in movement and thoroughly mixed with the water and sweet water which are added to the sugar to obtain a solution of the specific gravity desired. Any sand or heavy matter in suspension is allowed to fall to the bottom of the pan into the " sandbox " before the melted sugar is run off to the cloth filters. In a process employed with great success in some refineries the raw sugars are washed before being melted, and thus a purer article is obtained for subsequent treatment. in this process the raw sugar is mixed with a small amount of syrup so as to form a suitable magma, and is then run into a continuous centrifugal, where it is sufficiently washed, and from which it runs out, comparatively clean, into the melting pans described above.
Filters.—See also: They consist of tanks or cisterns fitted with " heads " from which a number of bags of specially See also:woven cloth are suspended in a suitable manner, and into which the melted sugar or liquor to be filtered flows from the melting pans. The bags, though 6o in. or more in circumference, are folded up in such a way that a sheath about 15 in. in circumference can be passed over them. Thus a maximum of filtering surface with a minimum of liquor in each bag is obtained, and a far greater number of bags are got into a given area that would otherwise be possible, while the danger of bursting the bags by leaving them unsupported is avoided. As the liquor goes on filtering through the bags they gradually get filled up with slime and sludge, and the clear liquor ceases to run. Steam is then turned on to the outside of the bags and sheaths, and hot water is run through them to See also:wash out all the sweets they contain. Large doors at the side of the cistern are then opened, and as soon as the bags are cool enough they are removed at the expense of very exacting labour and considerable time, and fresh bags and sheaths are fixed in their places ready for filtering fresh liquor. The dirty bags and sheaths are then washed, mangled and dried, and made ready for use again. In a refinery in Nova See also:Scotia a system has been introduced by which a travelling See also:crane above the bag filters lifts up any head bodily with all its bags attached, and runs it to the mud and washing tanks at the end of the battery, while another similar crane drops another head, fitted with fresh bags, into the place of the one just removed. The whole operation of thus changing a filter occupies about ten minutes, and there is no need for anyone to enter the hot cistern to detach the bags, which are removed in the open air above the mud tank. By this arrangement the work of a refinery can be carried on with about one-half the cisterns otherwise required, because, although it does not reduce the number of bags required per day for a given amount of work, it enables the refiner to use one cistern twice a day with fresh bags, instead of only once as heretofore. In some refineries the travelling See also:cranes are now run by electricity, which still further facilitates the work. Another method of enabling more work to be done in a given time in a given cistern is the use of a bag twice the ordinary length, open at both ends. This, being folded and placed in its sheath, is attached by both ends to the head, so that the melted liquor runs into both openings at the same time. The mud collects at the bottom of the u, and allows the upper part of the bag to filter for a longer time than would be the case if the bottom end were closed and if the bag hung straight like the See also:letter The clear, See also:bright syrup coming from the bag filters passes to the charcoal cisterns or filters. These are large cylindrical vessels from 20 to 50 ft. high, and of such diameter as to hold a given quantity of animal charcoal (also called " bone-black " and " See also:char ") in proportion to the contemplated output of the refinery. A very usual size of cistern forming a convenient unit is one that will hold 20 tons of char. Each cistern is fitted with a perforated false bottom, on which a blanket or specially woven cloth is placed, to receive the char which is poured in from the top, and packed as evenly as possible until the cistern is filled. The char is then " settled by water being slowly run on to it, in order to prevent the syrup making channels for itself and not permeating the whole mass evenly. The cistern being thus packed and settled is closed, and the syrup from the bag filters, heated up to nearly boiling point, is admitted at the top until the cistern is quite full. A small pipe entering below the false bottom allows the air in the cistern to escape as it is displaced by the water or syrup. In some refineries this pipe, which is carried up to a higher level than the top of the cistern, is fitted with a See also:whistle which sounds as long as the air escapes. When the See also:sound ceases the cistern is known to be full, and the entrance of further water or syrup is stopped. The syrup in the cistern is allowed to remain for about twelve hours, by which time the char will have absorbed all the colouring matter in it, as well as the lime. A cistern well packed with 20 tons of char will hold, in addition, about to tons of syrup, and after settling, this can be pressed out by allowing second quality syrup, also heated to nearly boiling point, to enter the cistern slowly from the top, or it may be pressed out by boiling water. By carefully watching the flow from the discharge cock of the cistern the change from the first liquor to the next is easily detected, and the discharge is diverted from the canal for the first liquor to the canal for the second liquor, and, when required, to the canals for the third and fourth liquors. Finally, boiling water is admitted and forces out all the last liquor, and then continues to run and wash out the sweets until only a trace remains. This weak solution, called " sweet water," is sometimes used for Melting the raw sugar, or it is evaporated in a multiple-effect apparatus to 27° Beaume density, passed through the char filter, and cooked in the vacuum pan like the other liquors. After the sweets have come away, cold water is passed through the char until no trace of lime or sulphate of lime is found in it; then a large manhole at the bottom of the cistern is opened, and the washed and spent char is removed. In most modern refineries the cisterns are so arranged that the spent char falls on to a travelling band and is conducted to an elevator which carries it up to the drying See also:floor of the charcoal kiln. Retorts for Reburning Char.—The kilns are made with either fixed or revolving retorts. The former perhaps produce a little better char, but the latter, working almost automatically, require less labour and attention for an equal amount of work, and on the whole have proved very satisfactory. From the drying floor on which the spent char is heaped up it falls by See also:gravitation into the retorts. These are set in a kiln or See also:oven, and are kept at as even a temperature as possible, corresponding to a dull See also:cherry-red. Below each See also:retort, and attached to it, is a cooler formed of thin See also:sheet-iron, which receives the hot char as it passes from the retort, and at the bottom of the cooler is an arrangement of valves which permits a certain amount of char to drop out and no more. With the fixed retorts these valves are worked from time to time by the attendant, but with revolving retorts they are worked continuously and automatically and allow from sixteen to twenty-four ounces of char to escape per minute from each cooler, and so make See also:room in the retort above for a corresponding quantity to enter from the drying floor. The reburnt and cooled char is collected and sent back to the char cisterns. In the best-appointed refineries, the whole of the work in connexion with the char is performed mechanically, with the exception of packing the filter cisterns with fresh char and emptying the spent and washed char on to the carrying bands. In former days, when refining sugar or " sugar See also:baking " was supposed to be a See also:mystery only understood by a few of the initiated, there was a place in the refinery called the " See also:secret room," and this name is still used in some refineries, where, how-ever, it applies not to any room, but to a small copper cistern, constructed with five or six or more divisions or small canals, into which all the charcoal cisterns discharge their liquors by pipes led up from them to the top of the cistern. Each pipe is fitted with a cock and swivel, in such a manner that the liquor from the cistern can be turned into the proper division according to its quality. Vacuum Pans and Receivers.—The filtered liquors, being collected in the various service tanks according to their qualities, are drawn up into the vacuum pans and boiled to crystals. These are then discharged into large receivers, which are generally fitted with stirrers, and from the receivers the cooked mass passes to the centrifugal machines. As in the beetroot factories, these machines work on different systems, but nearly all are arranged to turn out sugar in lumps or tablets presenting an appearance similar to that of See also:loaf sugar made in moulds, as this kind of sugar meets with the greatest demand. Granulated sugar, so called, is made by passing the crystals, after leaving the centrifugals, through a large and slightly inclined revolving See also:cylinder with a smaller one inside heated by steam. The sugar fed into the upper end of the cylinder gradually See also:works its way down to the lower, showering itself upon the heated central cylinder. A See also:fan blast enters the lower end, and, passing out at the upper end, carries off the vapour produced by the drying of the sugar, and at the same time assists the evaporation. The dry sugar then passes into arotating See also:screen fitted with two meshes, so that three grades of sugar are obtained, the coarsest being that which falls out at the lower end of the revolving screen. Recent Improvements.—Systematic feeding for the vacuum pan and systematic washing of the massecuite have been recently introduced not only into refineries, but also into sugar houses or factories on plantations of both cane and beetroot, and great advantages have resulted from their employment. The first-mentioned process consists of charging and feeding the vacuum pan with the richest syrup, and then as the crystals form and this syrup becomes thereby less rich the pan is fed with syrup of lower richness, but still of a richness equal to that of the mother-liquor to which it is added, and so on until but little mother-liquor is left, and that of the poorest quality. The systematic washing of the massecuite is the See also:reverse of this process. When the massecuite, well pugged and prepared for purging, is in the centrifugals, it is first washed with syrup of low density, to assist the separation of mother-liquor of similar quality, this washing being supplemented by the injection of pure syrup of high density, or ` clairce," when very white sugar is required. The manufacturers who have adopted this system assert that, as compared with other methods, not only do they obtain an increased yield of sugar of better quality, but that they do so at a less cost for running their machines and with a reduced expenditure in sugar and " clairce." " Clairce " is the French See also:term for syrup of 27° to 30° Beaume specially prepared from the purest sugar.
Apart from modifications in the details of sugar refining which have come intouse in late years, it should be mentioned that loaf sugar made in conical moulds, and sugars made otherwise, to re; semble loaf sugar, have practically disappeared from the trade, having been replaced by See also:cube sugar, which is found to be more economical as subject to less waste by grocers and housekeepers, and also less troublesome to buy and sell. Its manufacture was introduced into See also:England many years ago by Messrs See also: The cubes fall from the cutting machine on to a riddling machine, which separates those which are defective in size from the See also:rest. These latter pass to automatic weighing machines, which drop them, in quantities of I cwt., into wooden boxes of See also:uniform measurement, made to contain that weight; and the boxes are then conveyed to the storehouse, ready for sale,
History and See also:Statistics.—See also:Strabo xv. i. 2o, has an inaccurate See also:notice from See also:Nearchus of the Indian See also:honey-bearing See also:reed, and various classical writers of the first century of our era notice the sweet sap of the Indian reed or even the granulated See also:salt-like product which was imported from India, or from See also:Arabia
and Opone (these being entrepbts of Indian trade),' under the name of saccharum or getaxap1 (from Skr. sarkara, gravel, sugar), and used in See also:medicine. The See also:art of boiling sugar was known in Gangetic India, from which it was carried to China in the first half of the 7th century; but sugar refining cannot have then been known, for the Chinese learned the use of ashes for this purpose only in the Mongol period, from See also:Egyptian visitors? The cultivation of the cane in the West spread from Khuzistan in See also:Persia. At Gunde-Shaper in this region " sugar was prepared with art " about the time of the Arab See also:conquest,' and manufacture on a large scale was carried on at Shuster, See also:Sus and Askar-Mokram throughout the middle ages.' It has been plausibly conjectured that the art of sugar refining, which the farther See also:East learned from the Arabs, was See also:developed by the famous physicians of this region, in whose See also:pharmacopoeia sugar had an important place. Under the Arabs the growth and manufacture of the cane spread far and wide, from India to Sus in See also:Morocco (Edrisi, ed. See also:Dozy, p. 62), and were also
introduced into Sicily and See also:Andalusia.
In the See also:age of discovery the Portuguese and Spaniards
became the great disseminators of the cultivation of sugar; the cane was planted in Madeira in 1420; it was carried to San Domingo in 1494; and it spread over the occupied portions of the West Indies and South America early in the 16th century. Within the first twenty years of the 16th century the sugar trade of San Domingo See also:expanded with great rapidity, and it was from the dues levied on the imports brought thence to Spain that See also: One of the earliest references to sugar in Great Britain is that of roo,000 lb of sugar being shipped to London in 1319 by Tomasso Loredano, See also:merchant of Venice, to be exchanged for See also:wool. In the same year there appears in the accounts of the See also: Eryth. § 14; Dioscorides ii. 104. The view, often repeated, that the saccharum of the ancients is the See also:hydrate of See also:silica, sometimes found in bamboos and known in Arabian medicine as tabashir, is refuted by See also:Yule, Anglo-Indian Glossary, p. 654; see also Not. et extr. See also:des See also:MSS. de la bibl. nat. See also:xxv. 267 seq.
' Marco See also:Polo, ed. Yule, ii. 208, 212. In the middle ages the best sugar came frogn Egypt (Kazwini i. 262), and in India coarse sugar is still called Chinese and fine sugar Cairene or Egyptian.
' So the Armenian See also:Geography ascribed to See also:Moses of Chorene (q.v. for the date of the work); St See also: 372. ' Istakhri p. 91; See also:Yakut ii. 497. Tha'See also:alibi, a writer of the 11th century, says that Askar-Mokram had no equal for the quality and quantity of its sugar, " notwithstanding the great production of 'See also:Irak, jorjan and India." It used to pay 50,000 lb of sugar to the See also:sultan in annual See also:tribute (Lataif, p. 107). The names of sugar in modern European See also:languages are derived through the Arabic from the See also:Persian shakar.and beetroot factories were established at many centres both in Germany and in France. In Germany the enterprise came to an end almost entirely with the downfall of See also:Napoleon I.; but in France, where at first more scientific and economical methods of working were introduced, the manufacturers were able to keep the industry alive. It was not, however, till after 183o that it secured a firm footing; but from 1840 onwards it advanced with See also:giant strides. Under the See also:bounty system, by which the protectionist countries of Europe stimulated the beet sugar industry by bounties on exports, the production of sugar in bounty-paying countries was encouraged and pushed far beyond the limits it could have reached without state aid. At the same time the consumption of sugar was greatly restricted owing to the heavy See also:excise duties imposed mainly to provide for the payment of the bounties. The very large quantity of output made available for export under these exceptional conditions brought about the flooding of the British and other markets with sugars at depressed prices, not unfrequently below the See also:prime cost of production, to the harassment of important industries carried on by British refiners and sugar-growing colonies. In these circumstances, the British government sent out invitations on the 2nd of See also:July 1887 for an See also:international See also:conference to meet in London. The conference met, and on the 3oth of See also:August 1888 a convention was signed by all the See also:powers represented except France—namely, by See also:Austria, See also:Belgium, Germany, Great Britain, See also:Italy, the See also:Netherlands, See also:Russia and Spain. France withdrew because the United States was not a party to it. The first article declared that " The high contracting parties engage to take such measures as shall constitute an See also:absolute and See also:complete See also:guarantee that no open or disguised bounty shall be granted on the manufacture or exportation of sugar." The seventh article provided that bountied sugars (sucres primes) must be excluded from import into the territories of the signatory powers, by absolute See also:prohibition of entry or by levying thereon a special See also:duty in excess of the amount of the bounties, from which duty sugars coming from the contracting countries, and not bounty-fed, must be free. The convention was to be ratified on the 1st of August 1890, and was to'be put in force on the 1st of See also:September 1891.
The convention of 1888 was never ratified, and it is doubtful whether its ratification was urged, for a See also:bill introduced by the British government in 1889 to give it effect was not pressed, and it was See also:manifest that there was hesitation—which presently became refusal—to uphold the policy of the penalties on the importation of bountied sugar imposed by the seventh article, without which the convention would be so much waste See also:paper.
Eight years later, on the 1st of August 1896, the bounties offered by the governments of Germany and Austria-See also:Hungary were approximately doubled, and France had a bill in preparation to increase hers correspondingly, although it was computed that they were even then equivalent to a See also: But the minute and commission were not barren of result. A fresh conference of the powers assembled at Brussels, on the invitation of the Belgian government, on the 7th of See also:June 1898; and although the British delegates were not empowered to consent to a penal clause imposing countervailing duties on bountied sugar, the Belgian premier, who pre-sided, was able to assure them that if Great Britain would agree to such a clause, he could guarantee the See also:accession of the governments of Germany, Austria, See also: This decisive step was not long in making itself See also:felt in the chanceries of Europe. In October 1900 a conditional agreement for the reduction of the bounties was made in Paris between France, Germany and Austria-Hungary; in February 1901 the Belgian government proposed a new session of the Conference of 1898, and on the 16th of December following Brussels welcomed once more the delegates of all the powers, with the exception of Russia, to the eighth European Sugar Bounty Conference since that of Faris in 1862. The discussion lasted over eight sittings., but the conference, to which the British delegates had come with powers to assent to a penal clause, arrived at an understanding, and a convention was signed in March 1902. This was ratified on the 1st of February 1903, subject to a See also:declaration by Great Britain that she did not consent to penalize bounty-fed sugar from the British colonies. It was agreed " to suppress the direct and indirect bounties which might benefit the production or export of sugar, and not to establish bounties of this kind during the whole duration of the convention," which was to come into force on the 1st of September 1903, and to remain in force five years, and thenceforward from year to year, in case no state denounced it twelve months before the 1st of September in any year. A permanent commission was established to watch its See also:execution.45 The full See also:text in French, with an See also:English See also:translation, of the Sugar Convention, signed at Brussels on the 5th of March 1902 by the plenipotentiaries of the governments of Germany, Austria-Hungary, Belgium, Spain, France, Great Britain, Italy, the Nether-lands and Sweden, will be found in a return presented to See also:parliament in See also:April 1902 (See also:Miscellaneous, No. 5, 1902, Cd. 1013). Sugars polarizing From . . 75° 88° 65° 9o° 88° 930 198° 98° 99° 991° To . . 88° 93° 98° 98° 99° 991° 991° 100° 100° 100° Bounties (per cwt.) s. d. s. d. s. d. s. d. s. d. s. d. s. d. s. d. s. d. s. d. Countries- 2 3.3 1 2 4 4: 1 3 2 11.1 1 3 1 6 4 62 3 4'65 19'3 Russia . t 4 101 19'3 Austria- S Hungary France . Crystals Refined Germany Sugars classed as (per cwt.) Raw Sugar. Refined Sugar. Countries— . . . s. d. s. d. Belgium t to See also:Denmark . . 2 2i 0 7 6 . . — Sugars analysing in pure sugar (per cwt.) Hard Dry Refined. Less than . . 98 % 98 % and over. (Additional) Country— Holland . . s. d. s. d. s. d. 1 10.8, t 6 0 3 See also:Sir H. Bergne reported on the 27th of July 1907 to Sir See also:Edward Grey that The permanent session had met in special session on the 25th of July, to consider the See also:suggestion of His Britannic See also:Majesty's government to the effect that, if Great Britain could be relieved from the See also:obligation to enforce the penal provisions of the convention, they would he prepared not to give notice on the 1st of September next of their intention to withdraw on the 1st of September 1908 a notice which they would otherwise feel See also:bound to give at the appointed time "; and he added that " At this See also:meeting, a very general See also:desire was expressed that, in these circumstances, arrangements should, if possible, be made which would permit Great Britain to remain a party to the Sugar Convention." On the 1st of August 1907 the Belgian See also:minister in London transmitted to Sir Edward Grey a draft additional act pre-pared by the commission for carrying out the proposal of His Britannic Majesty's government, and on the 28th of August following an additional act was signed at Brussels by the plenipotentiaries of the contracting parties, by which they undertook to maintain the convention of the 5th of March 1902 in force for a fresh period of five years. On the 2nd of December 1907 Sir H. Bergne wrote to the foreign See also:office from Brussels, See also:reporting that a special session of the permanent commission, established under the sugar bounties convention, had opened on the 18th of November, and the principal matter for its consideration had been the application of Russia to become a party to the convention on special terms. A See also:protocol admitting Russia to the sugar convention was signed at Brussels on the 19th of December 1907. Sir A. H. See also:Hardinge on behalf of Great Britain made the following declaration: " The assent of His Majesty's government to the present protocol is limited to the provisions enabling Russia to adhere to the convention, and does not imply assent to the stipulation tending to restrict the importation of Russian sugar." When, in April 1908, Mr See also:Asquith became premier, and Mr See also:Lloyd See also:George See also:chancellor of the exchequer, the sugar convention The world's trade in cane and beet sugar in tons See also:avoirdupois at decennial periods from 1840 to 187o, inclusive, and yearly from 1871 to 1901 inclusive, with the percentage of beet sugar and the average price per cwt. in shillings and pence. Tons avoirdupois of 224o lb =1016 kilogrammes. Average Average Year. Cane. Beet. Total. Per cent. price Year. Cane. Beet. Total. Per cent. price
Beet. per cwt. Beet. per cwt.
s. d. s. d.
1840 1,100,000 50,000 1,150,000 4.35 48 0 1884-1885 2,351,000 2,545,000 4,896,000 51.98 12 4
1850 1,200,000 200,000 1,400,000 14.29 40 0 1885-1886 2,339,000 2,223,000 4,562,000 48.72 13 I
1860 1,510,000 389,000 1,899,000 20.43 35 0 1886-1887 2,345,000 2,733,000 5,078,000 53.82 II 9
1870 1,585,000 831,000 2,416,000 34.40 32 0 1887-1888 2,465,000 2,451,000 4,916,000 49.85 12 9
1871-1872 1,599,000 1,020,000 2,619,000 38.95 24 9 1888-1889 2,263,000 2,725,000 4,988,000 54.63 14 10
1872-1873 1,793,000 1,210,000 3,003,000 40.29 24 8 1889-1890 2,069,000 3,633,000 5,702,000 63.71 15 I
1873-1874 1,840,000 1,288,000 3,128,000 41.17 22 I0 1890-1891 2,555,000 3,710,000 6,265,000 59.21 14 0
1874-1875 1,712,000 1,219,000 2,931,000 41.59 20 I 1891-1892 2,852,000 3,501,000 6,353,000 55.10 13 6
1875-1876 1,590,000 1,343,000 2,933,000 45.78 18 I 1892-1893 3,045,000 3,428,000 6,473,000 52.95 14 3
1876-1877 1,673,000 1,045,000 2,718,000 38'44 22 8 1893-1894 3,490,000 3,890,000 7,380,000 52.71 13 5
1877-1878 1,825,000 1,419,000 3,244,000 43.74 23 0 1894-1895 3,530,000 4,792,000 8,322,000 57.75 9 II
1878-1879 2,010,000 1,571,000 3,581,000 43.89 19 2 1895-1896 2,830,000 4,315,000 7,145,000 50.30 10 7
1879-1880 1,852,000 1,402,000 3,254,000 43.08 19 3 1896-1897 2,864,000 4,954,000 7,818,000 56.18 9 3
188o-1881 1,911,000 1,748,000 3,659,000 46.13 20 4 1897-1898 2,898,000 4,872,000 7,770,000 62.70 II 9
1881-1882 2,060,000 1,782,000 3,842,000 46.38 20 4 1898-1899 2,995,000 4,977,000 7,972,000 62.70 II 9
1882-1883 2,107,000 2,147,000 4,254,000 50.47 20 2 1899-1900 2,904,000 5,510,000 8,414,000 65.48 II 6
1883-1884 2,323,000 2,361,000 4,684,000 50.40 16 8 1900-1901 2,850,000 5,950,0008,800,0oo 67.61 II 6
The quantities of cane sugar are based on the trade circulars of Messrs Willett & See also: The table has been adapted from the Monthly See also:Summary of Commerce and See also:Finance of the United States, See also:January 1902, prepared in the See also:Bureau of Statistics, Treasury Department, See also:Washington Government See also:Printing Office, 1902. Quantities of raw and refined cane and beet sugar in tons avoirdupois imported into the United See also:Kingdom in 1870 and in 1875, and yearly from 188o to 1901 inclusive, with the consumption per head of the See also:population in lb and the price per cwt. of raw and refined sugar. Consumption per head. Price per cwt. Year. Raw Cane. Raw Beet. Refined Cane. Refined Beet. Total. Total. Raw. Refined. Raw. Refined. 1870 Tons. Tons. Tons. Tons. Tons. lb lb lb s. d. s. d. 556,000 84,000 3,000 82,000 725,000 - - - - - 1875 705,000 107,000 16,000 128,000 956,000 50.64 8.88 59.52 21 2 30 4 1880 590,000 260,000 11,000 140,000 1,001,000 51.09 9.46 60.55 21 1881 623,000 310,000 5,000 135,000 1,071,000 56.01 8'44 64'45 21 9 229 8 ti 1882 726,000 265,000 6,000 133,000 1,130,000 58.78 8-38 67.16 21 I 28 8 1883 597,000 420,000 7,000 157,000 1,183,000 58.73 9'87 68.,o 20 I 27 2 1884 582,000 399,000 53,000 160,000 1,194,000 55.57 12.58 68-15 15 6 28 II 1885 561,000 410,000 114,000 152,000 1,237,000 55.46 15.75 71.21 13 10 18 2 1886 468,000 339,000 71,000 247,000 1,125,000 44.61 18.75 63'36 13 0 16 8 1887 439,000 461,000 39,000 311,000 1,250,000 50.80 20.25 71.05 12 1 15 8 1888 574,000 319,000 2,000 342,000 1,237,000 47.97 19.99 67'96 13 5 17 8 1889 470,000 407,000 1,000 448,000 1,326,000 48.38 26.54 74'92 15 5 19 8 1890 283,000 503,000 15,000 484,000 1,285,000 42.87 28.22 71.09 12 6 16 4 1891 349,000 461,000 27,000 540,000 1,377,000 45.08 32.94 78.02 12 10 16 6 1892 386,000 429,000 2,000 529,000 1,346,000 44.58 30.63 75.21 13 0 17 1 1893 368,000 434,000 2,000 575,000 1,379,000 42.41 33'17 75'58 14 2 18 4 1894 324,000 391,000 1,000 696,000 1,412,000 37.18 39.90 77.08 II 5 15 6 1895 388,000 463,000 1,000 706,000 1,558,000 45.28 40.10 85.38 9 7 13 4 1896 381,000 406,000 1,000 738,000 1,526,000 40.94 41.53 82'47 10 5 13 7 1897 242,000 434,000 1,000 793,000 1,469,000 34.52 43.92 78.44 9 0 12 3 1898 286,000 478,000 1,000 825,000 1,560,000 39.89 45'29 85.18 9 8 12 5 1899 186,000 469,000 1,000 889,000 1,545,000 35.63 48.68 84.31 10 6 12 7 1900 150,000 512,000 1,000 961,000 1,624,000 35.48 52.23 87'71 10 5 12 10 1901 178,472 526,451 1,000 1,079,553 1,785,476 36.80 56.40 93.20 10 6 12 0 of 1902 had thus been renewed in a modified form. Great Britain, instead of agreeing to prohibit the importation of bounty-fed sugar, was allowed to permit it under certain limits. Russia, which gave bounties, was to be allowed to send into European markets not more than I,000,000 tons within the next five years, and Great Britain undertook to give certificates guaranteeing that sugar refined in the United Kingdom and exported had not been bounty-fed. The renewal of the convention was disapproved by certain Liberal politicians, who insisted that the price of sugar had been raised by the convention; and Sir Edward Grey said that the government had intended to denounce the convention, but other countries had urged that Great Britain had induced them to enter into it, and to alter their fiscal system for that purpose, and it would be unfair to upset the arrangement. Besides, denunciation would not have meant a return to See also:prior conditions; for other countries would have continued the convention, and probably with success, and would have proposed prohibitive or retaliatory duties in respect of British sugar, with bad results politically. Still the British government had been prepared to denounce the convention in view of the penal clause which had ensured the exclusion of bounty-fed sugar, either directly or through the imposition of an extra duty. But this had been removed, and it was now unreasonable to insist on denunciation. Russia would have made the same arrangement she had obtained had we seceded from the convention. She had formerly sent to England about 40,000 tons of sugar yearly; she might now send 200,000 tons. Was this limitation a reason for sacrificing the advantages we had gained? Under the original terms of the convention Great Britain might have been asked to close her ports to sugar proceeding from one country or another. This was now impossible. The cane and beet sugar crops of the world for 1909-1910, with the average of the crops for the seven preceding years from 1902-1903, in tons of 2240 lb. A.-Cane sugar (compiled from the Weekly Statistical Sugar Trade Journal of Messrs Willett & Gray of New York, and books and reports published under the authority of the government of India). Crop. crop Cro Average crop p. Country. for 7 years end- Country. for 7 years end- 1909 1910 See also:ing 1908-1909. 1 ing 1908-1909 1909-1910 See also:Africa- Tons avoirdupois. Tons avoirdupois. Tons avoirdupois. Tons avoirdupois. Egypt 55,000 67,592 See also:Venezuela 3,000 3,000 Mauritius 220,000 183,688 Total in America 3,955,000 3,107,252 See also:Reunion 45,000 33,299 Natal 45,000 27,857 Total in Africa 365,000 312,436 Asia- America- . British India and Depen- See also:Argentina 120,000 132,410 dencies 3,750,000 3,600,000 Brazil 276,000 218,214 China I,000,000 1,000,000 British Colonies- Dutch See also:Colony- See also:Trinidad 45,000 45,232 Java and Madoera 1,200,000 1,019,739 Barbadoes . . . 40,000 37,492 See also:Japan and See also:Formosa . 130,000 94,225 Jamaica . . . 12,000 13,253 United States See also:possession- See also:Antigua and St Kitts . . 25,000 21,857 Philippine Islands 145,000 125,468 Demerara I15,000 See also:I14,922 See also:Siam . . . . 7,000 6,000 Lesser See also:Antilles 6,000 10,715 Total in Asia . 6,232,000 5,845,432 Total in British Colonies 243,000 243,471 See also:Costa Rica 2,500 2,657 Cuba 1,700,000 1,180,203 Danish Colony, St Croix 15,000 12,857 Australia and See also:Polynesia- Dutch Colony, Surinam 15,000 13,149 British slalonies- 69,E 49,928 See also:Fiji Islands French Colonies- See also:Queensland 136,000 144,000 Martinique . . . 40,000 34,279 New South See also:Wales 14,500 20,706 Guadeloupe 40,000 37,500 Total in Australia and Total in French Colonies 8o,000 71,779 Polynesia . . . 219,500 214,634 See also:Ecuador 7,000 _ 6,143 See also:Guatemala 7,500 8,016 Europe- See also:Haiti and Santo Domingo . 90,000 56,043 Spain 16,000 19,473 Mexico 130,000 114,790 Total in Europe '6,000 _ 19,473 See also:Nicaragua 4,500 4,260 Peru 150,000 143,619 Summary- See also:Salvador 6,500 5,646 Africa 365,000 I 312,436 United States- America 3,955,000 3,107,252 Louisiana 325,°0° 3 ,714 Asia 6,232,000 5,845,432 Australia and . Lous 15,000 0,711 Polynesia 219,500 214,634 See also:Porto Rico 280,000 176,286 Europe 16,000 Y 19473 . Hawaiian Islands . 490,000 404,424 Total production of cane Total in United States 1,105,000 890,995 sugar in the world 10,787,500 9,499,227 B.-Beet sugar (compiled from data furnished by the Statistisches Bureau See also:fur See also:die Rubenzucker Industrie des Deutschen Reiches, of Mr F. O. Licht, Magdeburg). Cro p' Cro p' Cro p' Cro p' Cro p' Cro p' Cro p' Estimated Average of 7 stimated Country. crop, years 1902-1903 1902-1903. 1903-1904. 1904-1905. 1905-1906. 1906-1907. 1907-1908. 1908-1909. 1909-1910. to 1908-1909. Tons Tons Tons Tons Tons Tons Tons Tons Tons
avoirdupois. avoirdupois. avoirdupois. avoirdupois. avoirdupois. avoirdupois. avoirdupois. avoirdupois, avoirdupois.
Austria-Hungary 1,040,987 1,149,516 $75,383 1,485,944 1,322,716 1,402,157 1,376,501 1,240,102 1,236,172
Belgium 220,550 200,233 173,679 323,577 278,3,38 228,682 254,258 246,051 239,902
Denmark 36,004 46,258 44,161 64,958 65,942 53,147 64,367 63,973 53,548
France 820,050 791,605 612,592 1,072,473 744,153 716,218 794,312 811,970 793,058
Germany . 1,734,624 1,897,234 1,572,923 2,379,959 2,203,810 2,095,959 2,049,951 2,007,780 ,99o,637
Holland 100,793 121,600 134,394 203,912 178,551 172,417 210,958 196,841 160,375
Italy 82,433 128,794 77,143 92,433 104,702 133,818 162,701 114,168 111,718
Russia 1,236,469 1, [87,848 938,565 953,204 1,417,386 1,387,732 1,237,530 1,131,840 1,194,105
United States . 192,376 204,847 206,410 279,236 426,171 433,248 377,945 418,288 302,890
Other countries 201,510 249,254 205,548 246,384 289,220 268,498 289,935 274,594 250,050
Total crop of the world 5,665,796 5,977,189 4,840,798 7,102,080 7,030,989 6,891,876 6,818,458 6,505,607 6,332,455
matter temporarily dropped, but certain Liberal members of parliament continued to See also:press for the withdrawal of Great Britain from the convention, it being stated that a promise had been privately given by Sir Henry See also: It would appear that the purchasing power of the inhabitants of India has increased of late years, and there is a growing demand for refined sugar, fostered by the circumstance that modern processes of manufacture can make a quality of sugar, broadly speaking, equal to sugar refined by animal charcoal, without using charcoal, and so the religious objections to the refined sugars of old days have been overcome. (A. CH.; V. W. CH.) SUGAR-See also:BIRD, the English name commonly given in the West India Islands to the various members of the genus Certhiola (belonging to the Passerine family Coerebidae1) for their See also:habit of frequenting the curing-houses where sugar is kept, apparently attracted thither by the swarms of flies. They often come into dwelling-houses, hopping from one piece of See also:furniture to another and carefully exploring the surrounding See also:objects with See also:intent to find a spider or See also:insect. In their figure and motions they remind a See also:northern naturalist of a See also:nuthatch, while their coloration—black, yellow, See also:olive, grey and white—recalls to him a See also:titmouse. They generally keep in pairs and build a domed but untidy See also:nest, laying therein three eggs, white, blotched with rusty-red. Many species are recognized, some of them with a very limited range; three are See also:continental, with a joint range extending from southern Mexico to Peru, See also:Bolivia and south-eastern Brazil, while others are See also:peculiar to certain of the Antilles, and several of them to one island only. Thus C. caboti is limited, so far as is known, to Cozumel (off See also:Yucatan), C. tricolor to Old See also:Providence, C. flaveola (the type of the genus) to Jamaica, and so on, while islands that are in sight of one another are often inhabited by different " species." The genus furnishes an excellent example of the effects of See also:isolation in breaking up an original form, while there is comparatively little differentiation among the individuals which inhabit a large and continuous area. The non-appearance of this genus in Cuba is very remarkable. (A. Additional information and CommentsThere are no comments yet for this article.
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