File:A manual of X-ray technic (1917) (14734891326).jpg

Identifier: manualofxraytech1917chri (find matches)
Title: A manual of X-ray technic
Year: 1917 (1910s)
Authors: Christie, Arthur Carlisle, 1879-
Subjects: Radiography, Medical Diagnosis, Radioscopic X-rays Bones Gastrointestinal system Radiography Bone Neoplasms Gastrointestinal Diseases
Publisher: Philadelphia London : Lippincott
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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e target is placed obliquely to theaxis of all tubes so that the greater part of the Rontgenrays are thrown out at one side. The accessory anode is made of aluminum. It isconnected to the anti-cathode by a wire outside of thetube. Tubes furnished with an accessory anode donot increase in resistance so rapidly as do those ofolder models. Regulating the Vacuum in the RontgenTube.—The tendency of the Rontgen tube to increasein resistance, making it increasingly difficult for thecurrent to pass through it, has caused the introductionof many contrivances for lowering the vacuum when PRODUCTION OF RONTGEN RAYS 17 it has become too high. One of these was the osmo-regulator of ViJIard. It consisted of a platinum pinsealed into the tube with one end projecting outside.Heating the projecting end with a flame caused theplatinum to become porous and to absorb hydrogen,thus lowering the vacuum of the tube. Baking a tube in an oven at 200° to 300° F. forseveral hours will also lower the vacuum.
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Fig. 10.—Queens self-regulating tube. In 1896 Queens self-regulating tube came into use(Fig. 10). This tube had a relatively large accessorybulb B in which was sealed a smaller bulb bj the lattercontaining some chemical such as potassium chlorate.The smaller bulb connected directly with the mainbulb. When the vacuum in the main bulb was toohigh the current could no longer pass directly throughthe tube but sparked across the path of less resistance 18 A MANUAL OF X-RAY TECHNIC from the cathode C to the end of the adjustable wireW, causing the potassium chlorate in the small bulbto become heated. The vapor given off into the tubefrom the potassium chlorate lowered the vacuum inthe main bulb until the current could pass directlythrough, when the sparking from the cathode to theadjustable wire ceased. The regulating device most largely used at presentis one in which the accessory tube connects directlywith the main bulb (Fig. 9). Asbestos is the sub-stance usually used instead of the ch

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