A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . o make the necessary the exception of silver and gold, copper is the metal which has been most exten-sively worked by these processes. Skals are copied by obtaining impressions in sealing-wax, pressing a warm wire into theedge for a connection; rubbing black-lead over the wax to make the surface conducteous ;fastening a slip of zinc to the other end of the wire ; wrapping the zinc in brown paper,and putting the whole into a tumbler containing sul
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . o make the necessary the exception of silver and gold, copper is the metal which has been most exten-sively worked by these processes. Skals are copied by obtaining impressions in sealing-wax, pressing a warm wire into theedge for a connection; rubbing black-lead over the wax to make the surface conducteous ;fastening a slip of zinc to the other end of the wire ; wrapping the zinc in brown paper,and putting the whole into a tumbler containing sulphate of copper, a little salt-water hav-ing been poured into the lirown paper cell. ri,.\sTF,R OF Paris Medallions may be saturated with wax or stearine, and then treated,if small, like seals; if large, in a distinct trough, as in firj. 261. In this case the copy isin intaglio, and may be used as a mould for obtaining the fac-simile of the cast. Morecommonly, the cast is saturated with warm water, and a mould of it taken in wax, stearine,or gutta pcrcha. This is treated with black-lead, and in other respects the same as ELECTEO-METALLURGY. 493 Wood-cuts are treated with black-lead, and a copper reverse 13 deposited upon is used as a mould to obtain electrotype duplicates, or as a die for striking ofiF dupli-cates. Stkreotypk Plates are obtained in copper by taking a plaster copy of the type, treat-ing it plaster fashion, depositing a thin plate of copper upon it, and giving strength bybacking up with melted lead. Old Brasses may be copied by the intervention of plaster. Embossed cards or paper may be copied by first saturating with wax and then usingblack-lead. FiitJiT may be copied by the intervention of moulds, or may be covered with , twigs, and branches may have copper deposited upon them. The same for STATUKTTES, BUSTS, and STATUES. Leaves and flowers are furnished with a conducting surface by dipping them into a solu-tion of phosphorus in b
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
