Precious Stones: Considered in Their Scientific and Artistic Relations, with a Catalogue of the Townshend Collection of Gems in the South Kensington Museum

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Committee of Council on Education, 1883 - Gems - 111 pages
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Page 17 - But a caution as to the necessity in all specific gravity experiments of getting rid of air-bubbles may not be out of place. To attain this end boiled water should be used, and if mechanical contrivances fail (a feather or sable pencil) then the liquid and stone should be placed under the receiver of an air-pump and the air exhausted. Details concerning the specific gravity of each kind of precious stone will be found in Chapter VII.

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