. Elementary and dental radiography / by Howard Riley Raper . 9. If it is at all possible, it is certainly most desir-able to have the dark room well ventilated. Thewriter uses a Sirocco suction fan to force air intothe dark room and a ventilator diagramed in Fig. 390 to provide ameans of egress. No light is let in by this arrangement. In very hot Ucntilation ofDark Room. MAKING DENTAL RADIOGRAPHS 349 weather, open the ice box or refrigerator (if the dark room is equippedwith one) and direct the breeze of an electric fan onto the ice. This willlower the temperature of the room quite noticeably
. Elementary and dental radiography / by Howard Riley Raper . 9. If it is at all possible, it is certainly most desir-able to have the dark room well ventilated. Thewriter uses a Sirocco suction fan to force air intothe dark room and a ventilator diagramed in Fig. 390 to provide ameans of egress. No light is let in by this arrangement. In very hot Ucntilation ofDark Room. MAKING DENTAL RADIOGRAPHS 349 weather, open the ice box or refrigerator (if the dark room is equippedwith one) and direct the breeze of an electric fan onto the ice. This willlower the temperature of the room quite noticeably. Figure 391 illustrates how an extra-oral radio-graph may be made on a comparatively small means of the Van Woert film holder and in-dicator, the X-rays may be directed at right anglesto the surface of the film. When radiographing theupper teeth, it is not the exactly correct pose to have the X-rays strike thefilm surface at right angles; it is almost correct, however. Small extra-OralRadiograph on Tilm. Uan UJoert Tilm Bolder and Indicator Tig.
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