Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . se cakes are heated to such a degree onan inclined hearth as to cause the alloy of lead andsilver to run off, and allow the copper to remain. The leail and silver may be separated by cujiella-tion or by Pattinsons process, in which the alloy isallowed to cool slowly and the crystals removed asthey form, leaving the alloy relatively licher in sil-ver. By a repeti
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . se cakes are heated to such a degree onan inclined hearth as to cause the alloy of lead andsilver to run off, and allow the copper to remain. The leail and silver may be separated by cujiella-tion or by Pattinsons process, in which the alloy isallowed to cool slowly and the crystals removed asthey form, leaving the alloy relatively licher in sil-ver. By a repetition of the process an alloy of greatrichness is procured, an<l the operation may be fol-lowed by cupcUation, in whieli the lead is oxidized,melts, and runs otf. See LKAii-FtniNACE. Li-quation Hearth or Furnace. A hearthor furnace in which metals are se|iaratid liv exposureto a heat which melts one or more of them, but leavesthe othei- or others nnmelted. The disks of alloy — .say, copper, lead, and silver— are set on edge in a slanting jiosition on two ironplates, between which is an interval. Wedges areplaced between the disks until the furnace is charged,and the space around the disks is then filled in with Fig. -3^:- nBa3i||i.,~_--- LiriKiitHni-Yurnace. charcoal, the to|i of the furnace restorcd, and heatajijilied to the kindling in the chamber below. Asthe temperature increases, the alloy of lead and sil-ver, whose union is more intimate than that ofeither with the copper, becomes fused and runs downto a conductor on the bottom of the fire-chamber,and is led to the cistern in front, from whence it isladled, the lead ami silver being afterward separatedby cupellation. Liquid-carbon Furnace. A furnace in whichliijuid fuel, such as petroleum, is introduced into thefire-chamber and burnt in <.ontact with air and some- Fig. 2965.
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