W. Palmer Dearing, M.D.
JAMA. 1941;117(2):136. doi:10.1001/jama.1941.02820280058022.
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To the Editor:—  I desire to call attention to a statement on 35 mm. roentgenograms in the timely editorial entitled "Case Finding in Tuberculosis" (The Journal, May 17, p. 2278), which might well be amplified. Only projection is mentioned by the editor as a means of enlarging the fluorographic images for interpretation. Both theoretical physical considerations and practical experience indicate that viewing by transmitted light with suitable magnification is superior to projection. No opaque surface can reproduce the gradation and contrast in the originnal negative. Convenient viewers with excellent lenses permitting variable magnification are now commercially available, and a stereoscopic viewer is being developed which will permit stereoscopic fluorograms at a film cost of less than 1 cent a patient.In evaluating the 35 mm. technic, one should realize that methods and materials are still being improved under the stimulus of wide interest. It must be remembered that standard x-ray


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