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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quired. This sheetis placed upon the wet gelatine surface of one negative,and the lines on it are brought accurately into registerwith the shadows of the wires on the latter, and held inposition by two spring clips. A tracing is then made ofthe foreign body which is being localised. The same isthen done with the other negative. The celluloid sheet now shows the outlines of twoshadows of the foreign body in certain relation to thecross lines on its surface. In order to ascertain the exactsize and position of the foreign body, the celluloid is nowplaced on the stage of an apparatus called the Cross-thread Localiser. This is an apparatus for reconstructingthe geometrical positions under which the negatives wereproduced (fig. 130). LOCALISATION OF FOREIGN BODIES 499 It consists of a glass plate fixed horizontally with twolines scratched upon its surface at right angles to eachother, and intersecting at the middle point; these representthe wires on the couch. A vertical square rod supports
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Fig. 130.—Mackenzie Davidsons cross-thread localiser. A = Square with scale.B — Surface gauge. a T-piece of metal with three small holes ; the centre holeis vertically above the point of intersection of the lines,and the T-piece can be raised or lowered. It is carefullyadjusted, so that its height from the glass stage is preciselythe same as the radiant point on the anode of the Crookes 500 WOUNDS IN WAR tube was from the point of intersection of the cross-wires above the parchment of the couch. To the rightand left of the central hole are two others exactly 3centimetres from it, and the line joining these holes isexactly over one of the lines on the glass stage. Theselateral holes represent the two positions occupied by theanode of the X-ray tube when the negatives were beingtaken, and two thin silk threads pass through them tothe glass stage, where their ends are attached to weightedneedles. All that is necessary now is to place the celluloidtracing flat on the glass stage with

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