File:X-ray manual - U.S. Army (1917) (14570850267).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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D in one case and a quarter turnconnects D to B and C to A, meanwhile the transformerhas reversed so that electrons pass from D-B-tube-C-A. In Fig. 30 the cross-arm machine, E and A, C and F,B and G must be well insulated by barriers, or else theshaft must be unduly long. In the disc machine thediameter must be large enough to insure insulationbetween the shaft and the rim and also to avoid estab-lishing an arc between the fixed sectors along the edgeof the disc. Sparking Troubles. Dust and moisture may impair the insulation ofbarriers or disc. Remedy: Keep clean and wipe with acloth slightly moistened with kerosene. The cross-arm type must be well insulated where thearms pass through the shaft. If a break occurs there, itis not possible to patch it up. Get a new arm. FVjl f i r Li Hi £ A / rrrr IX Tr. Fw. 30. Secondary circuit of Snook machine. Cross-bar type rectifier-four arms. A £^H0, 1 ^ Tr. Fig. 31. Secondary circuit Walte & Bartlett machine—cross-arm type—two arms. 68
Text Appearing After Image:
Fig. 32. Secondary circuit for disc type of rectifier.

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