File:Wounds in war - the mechanism of their production and their treatment (1910) (14578000900).jpg

Identifier: woundsinwarmecha00stev (find matches)
Title: Wounds in war : the mechanism of their production and their treatment
Year: 1910 (1910s)
Authors: Stevenson, William Flack, 1844-1922
Subjects: Wounds, Gunshot Gunshot wounds Military Medicine Medicine, Military
Publisher: New York : W. Wood
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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ust be marked on the skin with a skin-pencil, sothat the second plate can be placed in exactly the sameposition. In this way also all the requirements for preciselocalisation can be attained. The method of taking stereoscopic negatives with thecanvas-covered couch, and working from below, is asfollows :—The tube having been placed in the desired posi-tion beneath the patient, a photographic plate, in the usualopaque envelopes, is placed on the patient over the partto be taken, and it is so placed that its borders are parallelto the borders of the couch. A skin-pencil is then used torule a line on the patients skin at the upper and lowerborders of the plate. One exposure is then made, andthe box with the tube is displaced six centimetres, eitheracross the couch or in its length. The plate already exposed is removed and another putin exactly the same place, the pencil-lines on the skinenabling this to be done at once. Another exposure isthen made, and these negatives are stereoscopic.
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t3 <u o G r- 1/1 o a,oo o (U(L) O 5o8 WOUNDS IN WAR Methods of Viewing Stereoscopic Negatives. There are several ways— 1. By converging the eyes. The two negatives areplaced side by side in correct position, that is, they mustbe so placed that the line of displacement of the tube mustbe parallel to the line connecting the eyes of the observer.There must, of course, be some suitable illumination behindthe negatives. The observer then stands at a convenient distance,which varies according to the size of the negatives. Hethen holds up a finger midway between his eyes and theplates. If he looks at his finger he sees it single, but thenegatives he sees double—in fact, four negatives are seenat first. But by a little practice the two inner imagescoalesce or fuse into one, and this middle image approachesthe eye and stands apparently in mid-air in striking stereo-scopic relief. Once the art of viewing them in this wayis acquired, it becomes very easy. The advantage is thatnegatives of

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