To Cast Bronze in Plaster.
Take to every 2 cups of plaster 1 of ox-horns burnt, mix them together and make your cast with it.
733.
When you want to take a cast in wax, burn the scum with a candle, and the cast will come out without bubbles.
734.
2 ounces of plaster to a pound of metal;— walnut, which makes it like the curve.
[Footnote: The second part of this is quite obscure.]
735.
[Dried earth 16 pounds, 100 pounds of metal wet clay 20,—of wet 100,-half,- which increases 4 Ibs. of water,—1 of wax, 1 Ib. of metal, a little less,-the scrapings of linen with earth, measure for measure.] [Footnote: The translation is given literally, but the meaning is quite obscure.]
736.
Such as the mould is, so will the cast be.
737.