ative,and thus it can collect duringexposure, and can reveal, ondevelopment, a number ofpoints which might escapenotice in a screen examina-tion. Moreover, the photo-graph gives a permanent re-cord, and one which can bemeasured and can be studiedby several independent ob-servers. The cryptoscope or… … Fig. 50.—The Cryptoscope (Cox). 86 THE RONTGEN RA YS IN MEDICAL WORK is a fluorescent screen, while the opposite end is provided withapertures for the eyes of the observer. The screen is thus viewed indarkness even in a lighted room. The instrument is of no great practical value for…
X-rays · Radiography
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