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George C. Johnston, M.D.
JAMA. 1917;LXIX(22):1902-1903. doi:10.1001/jama.1917.02590490066020.
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To the Editor:  —In The Journal, Nov. 3, 1917, p. 1521, Dr. Sinclair Tousey details a method of localization of foreign bodies. On account of his prominence as an author, Dr. Tousey having written a very valuable compilation on the roentgen ray, I think that it is unsafe to let the article referred to pass without question.Dr. Tousey states that by means of a grating laid on the plate, which merely serves the purpose of a scale for the measurement of the displacement of the shadow cast by a foreign body when the source of illumination casting the shadow is moved, the tube being placed at a distance from the plate of 21 inches and the tube shift of 3 inches being employed, he is able to read from the plate without calculation the actual distance of the foreign body casting a shadow from the surface of the plate.


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