. The Röntgen rays in medical work . ver; he then holds up his finger in the middle line betweenhis eyes and the skiagraphs, and while looking at the top of hisfinger he will observe double images of each radiograph. By alittle perseverance he will learn to make the two images in thecentre combine, and he then will have a beautifully clear stereoscopicimage apparently in the air. Behind to the right and left will betwo images, but these he soon learns to ignore, or he can cut themoff by bringing his hands cautiously from the outer side of each eyetowards the middle line, stopping the moment th
. The Röntgen rays in medical work . ver; he then holds up his finger in the middle line betweenhis eyes and the skiagraphs, and while looking at the top of hisfinger he will observe double images of each radiograph. By alittle perseverance he will learn to make the two images in thecentre combine, and he then will have a beautifully clear stereoscopicimage apparently in the air. Behind to the right and left will betwo images, but these he soon learns to ignore, or he can cut themoff by bringing his hands cautiously from the outer side of each eyetowards the middle line, stopping the moment the two side imagesare cut off. , It is, of course, convenient in this way to see negativesin stereoscopic relief immediately after development. Other forms of reflecting stereoscope may be used. A veryconvenient kind is one known in France as the stereoscope ofCazes. In this the pictures to be viewed lie flat on the table belowthe mirrors, which are supported on a brass pillar. This dispositionof the apparatus has certain Fig. 63.—Hand showing Skin Walshs Method. (Best seen with a magnifying glass.) PART IIMEDICAL AND SURGICAL APPLICATIONS DAVID WALSH, The advantages of Rontgen ray work to the medical man arenot confined to purely clinical purposes, but are here and thereextended to other branches of professional study, such as forensicmedicine, anatomy, and physiology. In order to deal with the subject systematically, it may be splitup into various sections. The following classification will be foundto cover most of the ground broken by this modern means ofaccurate investigation. A. Surgery. I. Foreign Bodies. II. Bones. (a) General Remarks. (b) Fractures and Dislocations. (c) Separation of Epiphyses. (d) Congenital and other Bony Deformities. (e) Diseases of Bone. (/) Other Surgical Points. (g) Action of Rays upon Micro-organisms. III. Mapping of Skin Surfaces. B. Dental Surgery. C. Nasal and Throat Surgery. D. Medicine. IV. Regional. (a) Thor
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