X rays, an introduction to the study of Röntgen rays (1914)
Kaye, G. W. C. (George William Clarkson), 1880-1941 · London : Longmans, Green · leaf 178
hic purposes, by pressing downsuch a tube tightly into the abdomen. The greater the distance of the bulb from the fluorescentscreen or photographic plate, the more correct the picture ;in practice the distance is usually from 12 to 24 inches.The spark-gap should not exceed 10 to 12 inches.… … Fig. 75.—Radiograph of the hip-joint Siemens Urns.
X-rays
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