The advance of photography : its history and modern applications (1911)

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352 THE ADVANCE OF PHOTOGRAPHY obtained by the X-rays no camera appliances are required. The plate, suitably shielded against the access of ordinary light, should be placed as near as possible to the portion Fie. 156. of the body which it is desired to photograph, and the rays turned on for the necessary length of time, the object in all cases being between the tube and the sensitive film. Original-Muller-Kiihlrohre, Series. Great care should be taken to prevent the fogging of plates by the X-rays ; the safest plan is to bring into the room only the plate it is desired to expose, and to allow the X-rays to act only during the actual time of exposure.