Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 306
es twisted together,and impregnated with diamond-dust. This method,however, is both tedious and irregular, and henceinstruments, infinitely more rapid and precise, havebeen substituted for the bow. Fig. 125 represents the mill of the lapidary, withthe polishing disk replaced by a steel disk with…
Precious stones · Diamonds · Gems
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