of bismuth, 2 ozs. of saltpetre, 2 ozs. of common salt, 1 oz. of
arsenic, and 1 oz. of potash.


165. MOULDS AND DIES

Take copper, zinc, and silver, in equal proportions, and melt them
together, and mould into the forms you desire, and bring the same
to a nearly white heat; now lay on the thing that you would take the
impression of, and press it with sufficient force, and you will find
that you have a perfect and beautiful impression. All of the above
metals should be melted under a coat of powdered charcoal.


166. TO SOFTEN HORN

To 1 lb. of wood ashes, add 2 lbs. of quicklime; put them into a
quart of water, let the whole boil till reduced to one third, then
dip a feather in, and if, on drawing it out, the plume should come
off, it is a proof that it is boiled enough, if not, let it boil a
little longer; when it is settled filter it off, and in the liquor
thus strained put in shavings of horn; let them soak for three days,
and, first anointing your hands with oil, work the horn into a mass,
and print or mould it into any shape you please.


167. TO MAKE MOULDS OF HORN

If you wish to take the impression of any coin, medal, &c.,
previously anoint it with oil, then lay the horn shavings over it in