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To Take Moulds of Figures

If the model or figure be composed of plaster of Paris, a mould is often taken in copper by deposition. The figure is saturated with wax (sce No. 3688), and copper deposited upon it sufficiently thick to bear handling without damage when taken from the model. The figure with the copper deposit is carefully 3684. Composition for Taking Moulds sawn in two, and then boiled in water, by of Medals, &c. Melt together equal parts which the plaster is softened and easily sepaof spermaceti, stearine or hard tallow, and rated from the copper, which now serves as white wax.

Or: Mix together by melting, the mould in which the deposit is to be made. pound black resin, pound hard tallow, and It is prepared in the same way as we have de- 6 ounces bees' wax. This last is more adapted scribed for depositing in copper moulds. (See for coarse work, such as architectural orna- No. 3672.) When the deposit is made suffiments, &c., and is poured on the object to be copied (previously oiled) in a melted state.

Articles in plaster of Paris must be first soaked in water, observing that none remains on the surface so as to interfere with the design. 3685. Το Make and Use Elastic Moulding. The process patented by Mr.

Parks for taking a mould of any kind of model in one piece, is excellently adapted for the electrotypist. The material is composed of glue and molasses. 12 pounds glue are steeped for several hours in as much water as will ciently thick, the copper mould is peeled off, and the two halves of the figure soldered together. The copper moulds which are deposited upon the wax models taken in the elastic moulding are often treated in the same manner; but more generally these moulds are used for depositing silver or gold into them, to obtain fac-similes of the object in these metals, in which case the copper moulds are dissolved off by acids.