Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 304
r. The axis, driven bythe belt from the wheel, is pierced at the centrewith an orifice, into which the tools for cutting thestone are firmly fixed by means of a screw. Theengraver wets the extremity of the mounted rodwith diamond-dust made into a paste with olive-oil, and as the wheel is in motion… … Fig. 123.—The Lathe at work. stone with ease. As the design is frequently veryelaborate and of the greatest delicacy, the tools arenecessarily multiform. Among the different varieties there are four most 284 PRECIOUS STONES. used. The first is hollow; it describes circles withthe utmost facility,…
Precious stones · Diamonds · Gems
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