| 摘要 |
A method of identifying a material, such as a gemstone by applying a thermocouple to a stone, the thermocouple comprising two dissimilar metals having junctions spaced close to each other, heating one of said junctions, applying the other junction to the stone via a high thermal conducting tip and, recording the thermoelectric e.m.f. developed between the junctions which recorded value provides a determination of the type of material.
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