Electro-metallurgy Practically Treated

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D. Van Nostrand, 1879 - Electrometallurgy - 195 pages
 

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Page 34 - to the thickness or height of which must be the depth on the block, seeing that the latter is in fact (to simplify the matter) a cast or reverse of the former. But if this composition were spread on the plate as thickly as required for this purpose, it would be impossible for the artist to put
Page 35 - another piece of metal to strengthen it, and then mounted on a piece of wood to bring it to the height of the printer's type. This completes the process, and the glyphographic block is now ready for the press. "It should, however, have been stated previously,
Page 69 - deposit the gold per se; otherwise the deposit will take place so rapidly that the gold will peel off when being burnished, or even scratch-brushed. When iron or steel goods are to be gilt, they should be first rendered free from grease, by being immersed in a solution of caustic soda or potassa ; they
Page 8 - is to insure a perfect connection between the positive pole and the cylinder, and to save the trouble of soldering. A circular piece of wood forms a covering to the jar; in the centre of this cover, a hole about two inches in diameter is bored, to which an ox-gullet D, or
Page 33 - a description of which process we give herewith :— " A piece of ordinary copper plate, such as is used for engraving, is stained black on one side, over which is spread a very thin layer of

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