A popular treatise on gems, in reference to their scientific value; a guide for the teacher of natural sciences, the jeweller, and amateur: together with a description of the elements of mineralogy, and all ornamental and architectural materials .. (1859)
Feuchtwanger, Lewis. [from old catalog] · New York, D. Appleton & company · leaf 88
erence in the weight beingthat of an equal bulk of the latterfluid. Hence, assuming, as is com-monly done, the specific gravityof pure distilled water to be equalto 1 or unity, the specific gravity(G) of the other body is equal to its weight in air (io), di-vided by the loss or difference (G) of… … Fig. 94. 82 A POPULAR TREATISE ON GEMS. accuracy; and even a good common balance is often pref-erable. The mineral may be suspended from one arm orscale by a fine silk thread or hair, and its weight ascer-tained, first in the air, and then in water. There are a few precautions necessary to insure…
Precious stones · Building stones · Mineralogy
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