. Elementary and dental radiography . git be considered worth anything, 1 did not save money, but the finishedscreen offers more protection than any I know of on the market. A man may figure from the foregoing approximately what it willcost him to buy the kind of an outfit he wishes to purchase. Let us take a concrete example of a general practitioner who wishesto make the minimum investment and obtain an outfit with which hemay do the lighter work on films, and perhaps occasionally make a largeplate radiograph. His photographic paraphernalia costs say $4. As-suming that his supply current is
. Elementary and dental radiography . git be considered worth anything, 1 did not save money, but the finishedscreen offers more protection than any I know of on the market. A man may figure from the foregoing approximately what it willcost him to buy the kind of an outfit he wishes to purchase. Let us take a concrete example of a general practitioner who wishesto make the minimum investment and obtain an outfit with which hemay do the lighter work on films, and perhaps occasionally make a largeplate radiograph. His photographic paraphernalia costs say $4. As-suming that his supply current is A. C, he may purchase a high frequencyradiographic coil for $150. An X-ray tube costs $20, a tube stand $ makes his own screen the material for which costs $15. He spends$201 and has an outfit with which he can make small film radiographsin a 10 to 20 second exposure and large plate radiographs in about oneminute. CHAPTER X. Stereoscopic Kadiodrapby. 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 difficuh to explain briefly. It is sufficient for us to say here that togain a stereoscopic effect—that is, to get a picture ricli 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 tlicni into one. 297 298 DENTAL RADIOGRAPHY 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 subj
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