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OYQR , flow 1 b See also:dial tg~ ora c illezy with n t twad (shall) The See also:London by-See also:laws regulating drainage are very full and are strictly enforced. They include requirements regarding the See also:size, Drainage See also:form, gradient and methods of construction and repair of by-laws. drains, together with regulations affecting the See also:design and fixing of traps, fittings and other apparatus connected with sanitary arrangements. Some of the headings of the different clauses of the by-laws are subjoined:—See also:water-closets; See also:earth-closets; drainage of subsoil; drainage of See also:surface water; See also:rain-water pipes; materials, &c., for drains; size of drains; drain to be laid on See also:bed of See also:concrete 6 in. thick; if under buildings to be encased with 6 in. of zoncrete; drain to be benched up with concrete to See also:half its See also:diameter; fall of drain; See also:joints of drain; drain to be water-tight; thickness and See also:weight of See also:iron pipes; thickness of sockets and joints of stoneware pipes; drains under buildings; See also:composition of concrete; every inlet to drain to be trapped; drain beneath See also:wall to be protected by See also:arch, flagstone, or iron See also:lintel; drain connected with See also:sewer to be trapped and means of See also:access to See also:trap provided; no right-angled junctions to be formed either See also:vertical or See also:horizontal; at least two untrapped openings to be provided for See also:ventilation, each fitted with a grating or See also:cowl with apertures for passage of See also:air equal in See also:area to that of the See also:pipe to which it is fitted; ventilating shafts to be at least 4 in. in diameter, and if possible all bends and angles to be avoided; ventilating shafts to be of the same material, construction and weight as See also:soil-pipes; no unnecessary inlets to drains to be made within buildings; See also:waste-pipes from sinks and lavatories to be of See also:lead, iron or stoneware, trapped immediately beneath the fitting; See also:bell traps, See also:dip traps and D traps are prohibited; waste-pipes to See also:discharge in the open air into a properly trapped gulley; soil-pipes wherever practicable to be situate outside the See also:building and to be of See also:drawn lead or heavy See also:cast-iron; if fixed internally the pipes to be of lead with wiped joints; iron pipes to have socket joints not less than 22 in. in See also:depth and to be made with molten lead or flanged joints securely bolted with some suitable insertion; the soil-pipe not to be connected with any rain-water or waste-pipe, and no trap to be placed between the soil-pipe and the drain; the soil-pipe to be circular with an See also:internal diameter of not less than 32 in., and to be taken up above the building and its end See also:left open as an outlet for foul air; methods of connecting a lead pipe with an iron one; connexion of stoneware and lead, connexion of iron and stoneware; ventilation of trap of water-closet with an See also:anti-siphonage pipe of not less than 2 in. diameter and ventilated into the open air or into the soil-pipe at a point above the highest fitting on the soil-pipe; construction of slop sinks and urinals. The by-laws respecting See also:health and building in New See also:York See also:City are embodied in a large number of clauses. The more detailed health regulations are found in the Sanitary See also:Code 1903. These are by-laws framed by the See also:Board of Health under the authority of See also:section 1172 of the New York See also:Charter 1897. These must be taken in See also:conjunction with the See also:statute bearing on See also:plumbing in New York City which wasmade by the See also:Department of Buildings, 1896, and to which there have been several small amendments. Section 141 of the Building Code also deals with sanitation and in the See also:Tenement See also:House See also:Act 1901, 1902, 1903, See also:chap. 4, secs. 91 to 100 inclusive, deals with sanitary matters. From a See also:general point of view the requirements of the See also:American by-laws as to materials and methods of construction vary in a very slight degree from those in force under the London authorities. It is in the regulations affecting the See also:execution of the See also:work that we find a See also:great difference, and these in New York are of a more stringent See also:character than in any other See also:capital. Thus no sanitary, plumbing or See also:lighting work may be undertaken without first submitting for approval to the Department of Buildings See also:complete and suitable drawings and particulars of the materials to be used. Such a See also:notice is necessary even in the See also:case of See also:repairs and alterations to existing work. As a further See also:guarantee of the work being satisfactory it is ordained that no such work shall be executed except under the superintendence of a registered plumber. Every See also:master plumber in the city of New York or others working therein as such must obtain a certificate of competency from the Examination Board and be registered afresh every See also:year during the See also:month of See also: Where the capacity of an r8-in. circular pipe would be insufficient, built sewers are used in See also:place of stoneware pipes. These are sometimes circular or See also:oval, but more commonly of an See also:egg-shaped section, the invert or See also:lower See also:side of the sewer being a See also:curve of shorter See also:radius than the arch or upper side. The See also:advantage of this form lies in the fact that great See also:variations in the See also:volume of flow must be expected, and the egg-section presents for the small or dry-See also:weather flow a narrower channel than would be presented by a circular sewer of the same See also:total capacity. See also:Figs. 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