Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 274
.—Electrolysis of water. employed, and a double sulphate of nickel and ammonia.Copper succeeds best from a slightly acid solution of thesulphate. In electrotyping, an impression of the type orcut is first made in wax or gutta-percha, and this is thenrubbed over with graphite, in order to make it a… … Fig. 156.—Electroplating. afterward backed with type metal and mounted on awooden block, so as to make its face height equal to thatof ordinary type. Most of the copper ore of the world is bought and soldon the basis of the electrolytic assay. About a gram ofore is digested with acid. The insoluble…
Physics
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