DETECTIVE RAY
detecting imitation jewels
WORK OF BRITISH SCIENTISTS
Imitation sapphires can now be detected in a few seconds by tho electric "eye" known to the scientist as the cathode ray tube. The commercial use of the apparatus for this purpose is the result of the research work of Dr W. D. Coolidge in the laboratory of the General Electric Company, London, who themselves use more than 1.500,000 sapphires, which rank next to diamonds in hardness, as jewels for bearings in meters and other delicate electrical instruments.
Imitation sapphires are easily detected. Trays carrying both real and false are exposed in a dark room for a few moments to the powerful rays from the tube. It shoots out electrons at the rate of 150.000 miles a
second
All the jewels glow or radiate colours while exposed to the rays. When the rays are turned off the natural states cannot be seen: the synthetic keep on glowing. The rays even help to detect where the natural or factory-made gems
come from.
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https://paperspast.natlib.govt.nz/newspapers/BPB19410811.2.9
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Bay of Plenty Beacon, Volume 4, Issue 140, 11 August 1941, Page 3
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170DETECTIVE RAY Bay of Plenty Beacon, Volume 4, Issue 140, 11 August 1941, Page 3
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