Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 457
es a sort of coining-press is used for these purposes;the medal or other object is fixed either by mastic or byscrews on a piece of metal A, Fig. 1281, which descends withforce on the semi-fluid alloy. Previously to the operation of striking, the object is suspended by a cordpassing through a ring,… … ELECTRO-METALLURGY. 455 An impression may be given to a perfectly clean bright surface of sheet-lead, by placing upon it theobject to be copied, and then with a steady hand dealing a heavy blow. By this mode even a sealing-wax impression may be copied, although this, at first sight, would appear…
Mechanical engineering · Mechanics · Engineering
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