Practical radiography - a handbook for physicians, surgeons, and other users of X-rays (1901) (14755454974)

Identifier: practicalradiogr00isen (find matches)
Title: Practical radiography : a handbook for physicians, surgeons, and other users of X-rays
Year: 1901 (1900s)
Authors: Isenthal, A. W Ward, H. Snowden (Henry Snowden), 1865-1911
Subjects: Radiography X-rays X-rays Radiography X-Rays
Publisher: London : Published for The Photogram, Ltd. by Dawbarn and Ward, Ltd.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School



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Fig. 80. It permits the determination of the following fourquestions:— (1) The point vertically below the foreign body. (2) 160 Practical Radiography The size of same. (3) Vertical distance of foreign bodyabove screen. (4) Distance apart of two objects (evenwhen above each other). To determine factors (1) thehorizontal scale, anti-cathode and middle line of screen arebrought into approximately one plane and the lead indexin a line vertical to the scale and passing through the anti-cathode. By adjusting the screen so that the shadow ofthe foreign body falls concentric with the lead index, thevertical point on the surface of the limb may be ascer-tained (see Fig. 83). (2) The above manipulationis repeated for each margin ofthe foreign body and the dis-placement of the tube-holderas shown on scale directly givesthe size required. (3) Tube and screen areseparated as shown in Fig. 82.The tube is first orientated to amedium position with respectto the foreign body, and thendisplaced to th