File:X-ray manual - U.S. Army (1917) (14570652829).jpg

Identifier: xraymanualusarmy00unit (find matches)
Title: X-ray manual : U.S. Army
Year: 1917 (1910s)
Authors: United States. Surgeon-General's Office American Roentgen Ray Society
Subjects: X-rays Fractures Teeth Chest Heart Radiography
Publisher: New York : Middleditch
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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ve it and the second exposure is made. Thedistance of each position of the skin marker above theplate is then ascertained with the caliper and recorded. The negative having been developed and dried we havea plate showing two shadows of the foreign body andone shadow of the lead skin marker in each position.Remember also that in each position this marker wasvertically beneath the focus during the exposure, but;that the column (t) with its attachments was removed. Reassemblng the apparatus for operation. The neg-ative is replaced upon the base in exactly its positionduring the exposures. Column (t) is replaced and the two >indicators d and d made to occupy exactly the positionsof the two focal centers during the exposures. Thepointed weights m and m are placed upon the centersof the foreign body shadows and the threads run to d iand d. The point of contact marks the altitude of theforeign body. The support s is now adjusted and theindicating rods C and C are made to coincide with the
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Fig. 3. Late model Marion localizer, showing two pointers and table caliper. 147 148 X-RAY MANUAL—U. S. ARMY path of the vertical ray for each exposure. These rowill then if projected upward touch the centers of d amd1 and if projected downward will touch the centers o:the two skin marker shadows. With the aid of thicaliper the lower points of (c) and (c) are set to thheight above the plate of the skin markers as previousl;recorded. The pointer g is now set so that its lowe:end touches the point of contact of the threads and thrider (1) is set close to the sleeve (o). In later model!two pointers are both so adjusted. The threads, pointed weights, plate, and, if so desired,the upper support (s) are now removed. The pointei(g) (or both pointers if there are two) is pulled welup into the sleeve (o) taking care that the sleeve is nomoved, and the patient so adjusted under the poin(c) and (c) that these points are in exact contact wit)the permanent skin marks. The pointer g (or two) inow

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