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7
31.
TO CAST.
Tartar burnt and powdered with plaster and cast cause the plaster to
hold together when it is mixed up again; and then it will dissolve
in water.
7
32.
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.
7
33.
When you want to take a cast in wax, burn the scum with a candle,
and the cast will come out without bubbles.
7
2
34.
ounces of plaster to a pound of metal;-- walnut, which makes it
like the curve.
549
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