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 463
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
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