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Sterling, Ill., April 21, 1902.
To the Editor:
—About one year ago, in conjunction with a local jeweler, I exposed a number of gems, both real and imitation, to the x-rays. On developing the plate, we found that the image or shadow of the real gems was very dim and indistinct, while the shadow of the false gems was dark and very sharp, showing a well-marked difference in all instances; on carrying the experiments further we found that the shadows of all the stones we examined—and we examined all the more familiar ones—were invariably faint and indistinct, while the shadows of all the imitation ones were well marked and bold. We paid no particular attention to these experiments, as. while neither of us had ever seen any mention of this use of the Roentgen rays, we thought that surely some persons had made this discovery before. But now after a
Small HE. The Roentgen Rays in Detecting False and True Gems. JAMA. 1902;XXXVIII(18):1171–1172. doi:10.1001/jama.1902.02480180049014
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