Method and means for distinguishing gemstones

Details Method and means for distinguishing gemstones Method and means for distinguishing gemstones

1980-03-18

1982-04-13

Goldstein, Herbert

Measuring and testing

Gas content of a liquid or a solid

By vibration

G01N 2518

Patent

active

043241298

ABSTRACT:
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.

REFERENCES:
patent: 2330599 (1943-09-01), Kuehni
patent: 2951360 (1960-09-01), Sampson et al.
patent: 3611786 (1971-10-01), Schorr
patent: 3668927 (1972-06-01), Howell et al.
patent: 4255962 (1981-03-01), Ashman
"A Pulsed Thermal Comparator for the Schulte Measurement of Thermal Conductivity" in Proc. of the 9 Conf. on Thermal Conductivity, pp. 589-598, 10/69.

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