Page:A treatise on diamonds and precious stones including their history Natural and commercial.djvu/171

 SECT. XI.

On cutting and polishing precious Stones.

cutting and polishing of precious stones forms the business of the lapidary, an art materially differing from that of the diamond cutter.

lapidary's apparatus consists of a bench and several mills, adapted to the various operations he has to perform. They receive their motion from a wheel, which is turned with the left hand, by means of a crank. The mill used for cutting or rub-