Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 258
This screen when exposed to the X-rays becomes fluor-escent, and the shadows of objects placed on its outer sur-face may be seen by an observer looking in at the smallend, showing the peculiar effects hereafter described. The instrument is provided with a handle by which itcan be held to the eyes,… … Fig. 105. pared in the usual manner. Exposure of the plate orfilm to the light is not permissible for this purpose, asthe picture would, in that case, be a true photograph ofthe object, produced by reflected light, and not of itsshadow produced by the intercepted X-rays. Hence it isnecessary that…
Electricity
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