. Elementary and dental radiography / by Howard Riley Raper . Fig. 324. Double lens camera for making Fig. 325. Piatt changer. 326), which latter is simply a large plate changer made into a table. Theprinciple of all plate changers is the same. The part being radiographedrests undisturbed on a window of celluloid or thin aluminum, while theplates slide beneath in a tunnel. STEREOSCOPIC RADlOCRARHY .V»i

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