. Annals of the New York Academy of Sciences. Science. 42 TROWBRIDGE. source of Rontgen rays, and its shadow appears on the screen, but as the bones absorb the rays to a much greater extent than the flesh, they are projected as dark shadows, while the shadow of the flesh is so faint that it can hardly be seen. Thus, the bones of the hand appear distinctly in outline ; the effect being' somewhat similar to the silhouettes of ordinary light. Fig. 14. Edison Fluoroscope. Most of the appliances for obtaining visual effect of Rontgen rays by the use of the fluorescent screen are based on the dis- c
. Annals of the New York Academy of Sciences. Science. 42 TROWBRIDGE. source of Rontgen rays, and its shadow appears on the screen, but as the bones absorb the rays to a much greater extent than the flesh, they are projected as dark shadows, while the shadow of the flesh is so faint that it can hardly be seen. Thus, the bones of the hand appear distinctly in outline ; the effect being' somewhat similar to the silhouettes of ordinary light. Fig. 14. Edison Fluoroscope. Most of the appliances for obtaining visual effect of Rontgen rays by the use of the fluorescent screen are based on the dis- coveries of Professor Rontgen, for it was he who first discovered that fluorescent substances became luminous under the effects of the X-rays. He studied both this phenomenon and the effect of the rays upon the photographic negative in his famous research, and obtained shadows of the bones of the hand by the use of the fluorescent screen, as well as the more perma- nent shadow-pictures by the photographic process. The fluorescent effect of certain materials when subjected to the influence of Rontgen rays was, however, partly anticipated by certain observations of Dr. Lenard, of Bonn. This investi-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York Academy of Sciences. New York, New York Academy of Sciences
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
