Abstract
IT is interesting to note how pictures of the portions in relief on coins, medals, &c, can be obtained by means of radium rays. The coin or other object is placed directly in contact with a photographic plate which is enclosed in an envelope opaque to light. A few milligrams of radium bromide, contained in the usual mica-covered box, are placed some distance above the plate, and the whole left for several days. After development it is found that a clearly defined picture is obtained of the portions in relief on the under sides of the coins. Pictures have thus been obtained of the portions in relief on silver coins (half-crown, sixpence, threepence), also of a name engraved on a mother-of-pearl seal. Ten days was the time of exposure when ten milligrams of radium bromide were placed six inches above the plate, and the coin was a threepenny bit. Ten days also in the case of a half-crown when five milligrams were placed 11/2 inches above the plate.
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STROUD, H. Photographic Effect of Radium Rays. Nature 69, 560 (1904). https://doi.org/10.1038/069560d0
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DOI: https://doi.org/10.1038/069560d0
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