Perrot, Georges, 1832-1914, Chipiez, Charles, 1835-1901, Armstrong, Walter, Sir, 1850-1918 · London, Chapman and Hall, Limited; New York, A. C. Armstrong and Son · leaf 293
ontact with the instru-ment in the lathe, while, from time to time, he drops a mixture ofolive oil and diamond dust upon it with his right hand ; with thehelp of this powder the instrument grinds out all the requiredhollows one after the other. The first engravers who attacked precious stones had… … Fig. 13S.—Engraved shell. British Museum. a very early date. Moreover there was nothing to preventthem crushing the precious stones belonging to the class calledcorundum, such as sapphires, rubies, amethysts, emeralds, and theoriental topaz. No doubt the lathe or wheel was a comparativelylate…
Art
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