File:X-ray manual - U.S. Army (1917) (14570649688).jpg

Identifier: xraymanualusarmy00unit (find matches)
Title: X-ray manual : U.S. Army
Year: 1917 (1910s)
Authors: United States. Surgeon-General's Office American Roentgen Ray Society
Subjects: X-rays Fractures Teeth Chest Heart Radiography
Publisher: New York : Middleditch
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 13. Protection from surge by use of a lamp. Transformer
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Ftg. 14. Rheostat construction and connections.40 X-RAY PHYSICS 41 tendency to pass a spark to any grounded conductor is20,000 volts. This arrangement avoids in some measurethe tendency to discharge to patient, stand, and tubethat would result if the full terminal voltage were ef-fective to earth. Care must be taken to keep contacts on low voltageside tight. See that low tension wires are kept as faraway from the high tension terminals as possible. Iftrouble actually occurs, due to short circuit or break inthe transformer, there is no use in trying to repair it, asa rule, unless the trouble is close to the terminals. Ifthere is trouble arising from sparking across between thehigh tension terminals of the transformer attachingsmall spheres will relieve the tension and usually curethe trouble. Rheostat. An adjustable resistance is used to control the powerdelivered to the X-ray transformer. It consists of coilsof wire connected end to end; one end of the series ispermanently connected t

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