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cathode in its turn, with the result that even the finest lines of the original are faithfully reproduced. The electrolyte commonly contains about r z lb of copper sulphate and 2 lb of strong sulphuric See also:

ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid per See also:

GALLON

gallon, and is worked with a current See also:

DENSITY (Lat. densus, thick)

density of about ro amperes per sq. ft., which should give a thickness of o•000563 in. of copper per See also:

HOUR

hour. As See also:

time is an See also:

OBJECT

object, the conditions alluded to in the See also:

ARTICLE (from Lat. articulus, a joint)

article on COPPER as being favourable to the use of high current densities should be studied, bearing in mind that a tough copper See also:

DEPOSIT (Lat. depositurn, from deponere, to lay down, to put in the care of)

deposit of high quality is essential. Moulds for reproducing plates or art-See also:

WORK

work are often taken in See also:

PLASTER

plaster, beeswax mixed with See also:

Venice turpentine, fusible See also:

metal, or See also:

GUTTA (Latin for " drop ")

gutta-percha, and the surface being rendered conductive by powdered See also:

black-See also:

lead, copper is deposited upon it evenly throughout. For statuary, and " undercut " work generally, an elastic mould—of See also:

GLUE (from the O. Fr. glu, bird-lime, from the Late Lat. gluten, glus, glue)

glue and See also:

TREACLE

treacle (8o : 20 parts)—may be used; the See also:

MOULD

mould, when set, is waterproofed by See also:

IMMERSION (Lat. immersio, dipping),

immersion in a solution of See also:

POTASSIUM [symbol K (from kalium), atomic weight 39.114 0=16)]

potassium bichromate followed by exposure to sunlight, or in some other way. The best results, however, are obtained by taking a wax See also:

CAST (from the verb meaning " to throw "; the word is Scand. in origin, cf. Dan. kaste, and Swed. kasta; " cast " in Middle Eng. took the place of the A.S. weor pan, cf. Ger. werf en)

cast from the elastic mould, and then from this a plaster mould, which may be waterproofed with wax, black-leaded, and used as cathode. In art-work of this nature the See also:

PRINCIPAL

principal points to be looked to in depositing are the See also:

electrical connexions to the cathode, the shape of the anode (to secure uniformity of deposition), the circulation of the electrolyte, and, in some cases, the means for See also:

ESCAPE (in mid. Eng. eschape or escape, from the O. Fr. eschapper, modern echapper, and escaper, low Lat. escapium, from ex, out of, and cappa, cape, cloak; cf. for the sense development the Gr. iichueoOat, literally to put off one's clothes, hence to sli

escape of anode See also:

OXYGEN (symbol 0, atomic weight 16)

oxygen. See also:

SILVER

Silver electrotyping is occasionally resorted to for See also:

SPECIAL

special purposes.

End of Article: ELECTROTYPING

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