. Elementary and dental radiography / by Howard Riley Raper . torm curtains in buggies. If this material doesnot completely turn the light, it should be painted with thick black frame should be made to fit over, not into, the window casing. () With the frame so placed, if a little light comes in around it, itdoes not come directly into the room, but is reflected to the side. Themore perfect the darkness of the room the better, but the very little light 68 ELEMENTARY RADIOGRAPH) which can enter through a window with the blind drawn down, and witha well-made frame over it will n
. Elementary and dental radiography / by Howard Riley Raper . torm curtains in buggies. If this material doesnot completely turn the light, it should be painted with thick black frame should be made to fit over, not into, the window casing. () With the frame so placed, if a little light comes in around it, itdoes not come directly into the room, but is reflected to the side. Themore perfect the darkness of the room the better, but the very little light 68 ELEMENTARY RADIOGRAPH) which can enter through a window with the blind drawn down, and witha well-made frame over it will not cause any trouble. If the door to theroom permits light to leak in around it, such light should also be shut would be impossible, of course, to work to any advantage in aperfectly dark room, for we could not see what we were doing. Hencethe necessity of having a dark room lantern (Fig. 68s), which will givesufficient light to guide us in our work, without being of such nature asto have any action on plates or films. The term developing light—the. Fig. 68. Dark room lantern, light given by the dark room lantern—may mislead one to believe thatthe light in some way aids in developing a plate by its action on it. Butsuch is not the case. The light is of value only because it enables theworker to see. The light may be a candle, a coal oil lamp, or an incan-descent electric light shining through red glass. While such a lanterncan easily be made, the writer warns against it, for, though the light of ahome-made lantern may appear the same to the eye as the light of thelanterns manufactured by photographic supply manufacturers, its actionon a plate or film may be disastrously different. The lantern shown inFig. 68 consists of a i6-candle power incandescent light with a frostedglass bulb, in a light-proof tin box. the front of which is of removableglass. The light shines first through the frosted glass of the bulb, thenan orange-colored glass, then a ruby glass. In the dark
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