File:The Röntgen rays in medical work (1899) (14776799613).jpg

Identifier: rntgenraysinmedi00wals (find matches)
Title: The Röntgen rays in medical work
Year: 1899 (1890s)
Authors: Walsh, David
Subjects: X-rays Radiography X-Rays Radiography
Publisher: London : Baillière, Tindall and Cox
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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eboard or wood are translucent, whilethose made of metals, except aluminium, are of course opaque.Plaster of Paris is dense, but a photographic record can beobtained through such a splint by using a focus tube of highpenetration; in which case the resulting photograph is apt to bemottled and patchy, owing to the varying thickness of theplaster. A good substitute for plaster is the handy water-glass or silicate of sodium splint, which is translucent to the rays, andmay be used conveniently where it is intended to take a Rontgenphotograph during the progress of any particular case. Nowhere is the necessity for comparative photographs more 128 THE ROXTGEX RA YS IN MEDICAL WORK evident than in the case of obscure fractures. A slight pecu-liarity of the individual bone may be exaggerated into a patho-logical guise by the peculiar relative position of the tube, by therays falling obliquely on the plate, or by an awkward attitudeof the patient. In one case of alleged old-standing fracture of
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Fig. 52.—Lyxn Thomass Distortion Experiment. (Six specimens of ulnae with the bases of their styloid processes sawn through, but not detached, with a fret-saw. On the right is a radius with six fissures, made by the same fret-saw, through its ulnar margin.) the external condyle of the humerus, the reading of the Eontgenphotograph itself, without another of the sound elbow taken undersimilar conditions, became a matter of pure conjecture. A fracture may not be shown on the plate because the aj-rayshave not hit the gap in the bone in their straight passage fromthe anti-kathode to the sensitive plate. Then the break itselfmay be oblique, and thus interpose overlapping edges of bone

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