Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 264
RECIOUS STONES. 243 of Kircher that the industry had greatly advanced.To the unburned brick of Cardan, in whose cavityhis mixture for precious stones was heated, excel-lent crucibles had succeeded; special furnaces hadreplaced the brick-kiln; and in the time of Kircher,that_is to say, about the… … Fig. 96.—Egyptian Moulding in Ceramic Paste. No other proof is needed than the writings ofKircher to dissipate the error that has ascribed theinvention of strass—a peculiar kind of glass of con-siderable refractive power, which forms the base ofall modern artificial gems—to a workman of thatname,…
Precious stones · Diamonds · Gems
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