. Elementary and dental radiography / by Howard Riley Raper . napolis; the Kelly-Koett Mfg. Co., Covington, Ky.;the Wm. Meyer Co., Chicago; the Wappler Mfg. Co., New York City;the Kny-Scheerer Co., New York City; the Campbell Electric Co., Lynn,Mass.; the Vulcan Coil Co., Los Angeles; the H. G. Fischer & Co., Chi-cago; Noyes Bros. & Cutler, Inc., St. Paul; Geo. W. Brady & Co., platemanufacturers, Chicago; Roentgen Mfg. Co., Philadelphia; Green &Bauer Tube Co., Hartford, Conn.; MacAlaster-Wiggins Tube Co., Chi-cago ; Machlett & Son, tube manufacturers, Chicago; Mcintosh Battery& Optical Co., Ch
. Elementary and dental radiography / by Howard Riley Raper . napolis; the Kelly-Koett Mfg. Co., Covington, Ky.;the Wm. Meyer Co., Chicago; the Wappler Mfg. Co., New York City;the Kny-Scheerer Co., New York City; the Campbell Electric Co., Lynn,Mass.; the Vulcan Coil Co., Los Angeles; the H. G. Fischer & Co., Chi-cago; Noyes Bros. & Cutler, Inc., St. Paul; Geo. W. Brady & Co., platemanufacturers, Chicago; Roentgen Mfg. Co., Philadelphia; Green &Bauer Tube Co., Hartford, Conn.; MacAlaster-Wiggins Tube Co., Chi-cago ; Machlett & Son, tube manufacturers, Chicago; Mcintosh Battery& Optical Co., Chicago; Kesselring X-Ray Tube Co., Chicago; the RogersElectric Laboratories Co., Cleveland, Ohio; the Eastman Kodak Co.,Rochester, N. Y.; the Cramer Dry Plate Co., St. Louis, Mo.; Snook^Roentgen Mfg. Co., Philadelphia, Pa.; Waite & Bartlett Co., New YorkCity; Columbia X-Ray & Electric Corporation, New York City. CHAPTER X. Stereoscopic Radiography. The word stereoscopic is derived from two Greek words, meaningsolid and to Fig. 322. Hand stereoscope in use. The phenomenon of the stereoscopic picture or radiograph is onevery difficult to explain briefly. It is sufficient for us to say here that togain a stereoscopic effect—that is, to get a picture rich in perspective—we must have two pictures, one for each eye, and observe them with astereoscope (Figs. 322 and 323). When the two pictures are properlyfocused in the stereoscope, the observer no longer sees two flat picturesof the same object, but, instead, the single object stands out in clearperspective, just as it would if we looked at the object itself, the twopictures being registered on the retina of either eye and the merging centreof the brain fusing them into one. 298 ST hit )S(()PIC NADU )GRAPHY 299 To make stereophotographs it is necessary to use a special, double-lens camera (Fig. 324), which takes a picture for each eye 337 and 338 are stereophotographs. A moments consideration of the
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