File:The Röntgen rays in medical work (1907) (14777332893).jpg

Identifier: rntgenraysinmedi1907wals (find matches)
Title: The Röntgen rays in medical work
Year: 1907 (1900s)
Authors: Walsh, David
Subjects: X-rays Radiography X-Rays Radiography
Publisher: New York : William Wood
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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pment of that most serious trouble, chronic x-ray dermatitis. Other protective devices for the operator which may be mentionedconsist in the provision of metallic shields or guards at thesides of fluorescent screens to protect the hands during screenexaminations, as this branch of x-ray work has been found to be afruitful cause of dermatitis. The warming of high-resistance tubeswith a spirit-lamp when in action on the coil has also led to theproduction of dermatitis in many cases, and spirit-lamps with longebonite handles are now made to obviate this risk. Aprons ofheavy rubber should be worn by operators who spend much timenear x-ray tubes. Focussing Diaphragms.—The sharpness of a photograph of * Messrs. Gent of Leicester. f Watson and Sons, High Holborn. 94 THE RONTGEN HA YS IN MEDICAL WORK the thicker parts of the body may often be increased by the use ofa diaphragm of metal or of thick glass between the tube and thepatient. The best form which the diaphragm can take is that of a
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short tube of lead or heavy glass, as this has a better effect thana disc in sharpening the image. The tube-shield shown in Fig. 57acts very well in improving the focus of a>ray photographs. THE ELECTRICAL APPARATUS 95 Lamps for Negatives.—For the examination or the exhibitionof negatives a lantern illuminated by artificial light is mostgenerally convenient. The simplest form resembles an ordinarydark-room lamp in which the negative is inserted in the place ofthe pane of ruby glass. The effect is improved if a sheet of plainground glass is placed behind the negative, and if the negativesare very thin a sheet of opal glass is even better. Such a lanternmade of japanned tin, with a semi-cylindrical back, and painted whiteinside, can be made very cheaplyby a tinsmith to take the size ofnegative most commonly made useof. An electric lamp affords thebest means of illuminating it. Elaborate lanterns made incabinet work for the illuminationof ic-ray negatives are figured bythe instrumen

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