. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. I. Figure 2 shows the same diagram butwith a fluorescent screen interposed be-tween the eyes and the object of each; ashadow will have to be cast similar to thatin the lines of vision shown. ^ /f/ \/ I. t 1 / / / , / \ \ /\ ^ R EYE. 250 Editorials This can obviously only be done by tubesin a corresponding position, and the dia-gram will clearly show that the image pro-jected by the right tube must be seen bythe left eye, if a true stereoscopic effect isto be obtained, otherwise the effect ispseudo-s
. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. I. Figure 2 shows the same diagram butwith a fluorescent screen interposed be-tween the eyes and the object of each; ashadow will have to be cast similar to thatin the lines of vision shown. ^ /f/ \/ I. t 1 / / / , / \ \ /\ ^ R EYE. 250 Editorials This can obviously only be done by tubesin a corresponding position, and the dia-gram will clearly show that the image pro-jected by the right tube must be seen bythe left eye, if a true stereoscopic effect isto be obtained, otherwise the effect ispseudo-stereoscopic, which means that thewhole of the relief is reversed. Yours truly, Geoffrey Pearce, Hon. Treasurer. New York City, April 7, 1919. The Editor, The American Journal of Roentgenology. Dear Sir: The diagram on page 548 unfortunatelydoes not agree with the text, inasmuch asit shows the shutter in proper phase forpseudoscopic rather than true stereo-scopic vision. However, this is fully asuseful as true stereoscopic vision in manyinstances, and it is especially valuable inthe localization of foreign bodies. Thechange may be instantly made from onetype of vision to the other at the will ofthe operator by throwing a pole changingswitch in the transformer primary circuit. Fig. 2 o
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