X rays, an introduction to the study of Röntgen rays (1914)
Kaye, G. W. C. (George William Clarkson), 1880-1941 · London : Longmans, Green · leaf 181
ismuth saltsgive off secondary rays just like those from bismuth metal. Stereoscopic Radiography. In this work, two distinct pictures are taken in turn bymoving the X-ray tube, between the exposures, 2 or 3 inchesparallel to the surface of the plate, the distance betweentube and subject being about… … Fig. 78.—Bismuth radiograph of the intestines. The black circular spotnear the centre of the picture is produced by a metal disc which is placed onthe umbilicus as a landmark. diagnosis. There are other types of localisers, some of whichdisplay much ingenuity of design ; they can be found…
X-rays
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