The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 238
ner of preparing and arranging the objects on whicha metallic deposit is to be formed. 232 ELECTRO-METALLURGY. back and edges with a coating of wax or varnish, to protectthese parts against the eifects of galvanic action. Attach to theend of the other positive wire a small piece of sheet-copper,… … ment, where three separate medals are being copied by theaction of the same galvanic current. A bright film of purecopper will soon form on the coin or medal; and, if the actionbe continued for a day or more, the metal will acquire con-siderable thickness, and may be removed, when it will be…
Physics
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