. American quarterly of roentgenology . w hU) LJ X oo DC. 09 4J « 3> O-0 V0-0 O ■i-s —O Jc3 6C O ill sO I to A M bfl c c 0 0 OSS 0 to *g. 11 .S*o a > OU3 O z z111III(0 o z 3 J* s o CO 13 \ Dunham: Stereo-Chest Plates 113 their work. As has been seen one plate must be exposed, thetube moved, Plate 1 must be replaced by Plate 2, and thesecond plate exposed. This must be done quickly, the patientmust not move, his diaphragm must not jerk and his heartmust not beat a sufficient number of times during eitherexposure to blur the lung markings. This is accomplished, after the first exposure, by
. American quarterly of roentgenology . w hU) LJ X oo DC. 09 4J « 3> O-0 V0-0 O ■i-s —O Jc3 6C O ill sO I to A M bfl c c 0 0 OSS 0 to *g. 11 .S*o a > OU3 O z z111III(0 o z 3 J* s o CO 13 \ Dunham: Stereo-Chest Plates 113 their work. As has been seen one plate must be exposed, thetube moved, Plate 1 must be replaced by Plate 2, and thesecond plate exposed. This must be done quickly, the patientmust not move, his diaphragm must not jerk and his heartmust not beat a sufficient number of times during eitherexposure to blur the lung markings. This is accomplished, after the first exposure, by having atube carrier that will move just the necessary distance andno more by pulling one string while another string pullsPlate 1 out and Plate 2 in, without disturbing the accomplished, the second exposure is made. The plates are then developed, dried, placed in a large-sized Whetstone stereoscope and read. The distance the tube is moved—B—is called the base-line, and this should be parallel to the plate. A pe
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