Impressions (To Copy). To take an exact mould of any coin, medal, embussed or stamped paper, or in fact, of any device, raised or imprinted (that is, sunk on paper), cut a piece of cardboard, say to the breadth of half an inch, with which form a ring just the dimension of the impression to be taken ; then pour within the said ring, which surrounds the spot, melted fusible metal; the carding will prevent the metal from running away, and in a few minutes it will cool and take the impression, without the slightest injury to the paper from which it was taken. The impression, etc, taken will be the same as the original but reversed. Fusible metal is a compound of eight parts of bismuth, five of lead, and three of tin, which liquefies at 212 degrees, or the same temperature as boiling water, and below that if one part of quicksilver be added.