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Ch. 9: Heat tests on Gems

Ch. 9: Heat tests on Gems Page of 118 Ch. 10: Magnetic and Electric Tests Text size:minus plus Restore normal size   Mail page  Print this page
56                         PRECIOUS STONES
For the purpose under consideration, the temperature of the pencil of heat applied to the stones in their several portions was kept constant. It will be seen, therefore, that no great reliance can be placed on the heat test as applied to precious stones.
Ch. 9: Heat tests on Gems Page of 118 Ch. 10: Magnetic and Electric Tests
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