Identifier: systemofinstruct00mone (find matches)
Title: A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice
Year: 1902 (1900s)
Authors: Monell, S. H. (Samuel Howard), d. 1918
Subjects: Vibration X-rays Diagnosis, Radioscopic Thermotherapy Electrotherapeutics X-Ray Therapy Vibration Diagnosis
Publisher: New York : E.R. Pelton
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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ome other distance would be refuted by the internalevidence of the negative. It is impossible to tamper with this evidence, or alter its plainfindings if the landmark is used as designed. If fraud was imder-taken, the obvious deviation of the shadow when confronted by astandard landmark would convict the witness of the attempt. Inany case, the landmark will not only stigmatize fraud, but will throwcareless guesswork out of court and compel a more correct pictureof the part. An accurate picture must shadow the parts in the rela-tion which appears when the path of the rays forms a right anglewith the plane of the negative. Any deviation from an exact perpen-dicular creates proportionate obliquity and mars the diagnostic inter-pretation of some pictures. When the plate has been exposed afterthe usual precaution to insure perpendicular rays upon the part, theshadow of the authors landmark on the negative affords final andpermanent proof of the accuracy or error of the preceding steps. 208
Text Appearing After Image:
Plate 49.—Authors Distortion Landmark Seen from the Front. The landmark is onthe wrapper of a photographic plate which is on the brass base of the Authors PositionFinder. The upper and lower cross-bars are in register and show as one shadow. The rela-tive ^sizes of the two circles appear as they faced the camera. At twenty inches from thefocus of the tube the divergence of the rays brings the upper and smaller circle into registerwith the lower and larger circle so that the shadows merge if the register is exact, or bytheir deviation prove the precise amount of distortion that occurred. See frontispiece forexample of result in radiograph. See next plate for instruction in method of use.

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