Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 469
d in the verti-cal plate frame by two copper hooks; the engraved plate is then similarlyfixed in a similar frame, when both are placed in a vertical vat and connectedwith the battery. The process does not go on well when the plates are vertical, but it is ne-cessary to start the castings in this… … ELECTRO-METALLURGY. 461 forming plate. For common electrotypes, dust or mote specks are not detrimental: but the Coast Sur-vey copper plates being not inferior in fineness of lines to fine steel plates, the effect of impurities settlingon the face of their copies is to give the impressions a…
Mechanical engineering
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