. Elementary and dental radiography . hrough the plate just at tJic edge. Whenthe glass side is up one is able to look through the glass and see the filmbeneath. The sensitive side of the plate slnmld present tcnvard thesmooth side of the envelope—awa)- from the seam side. The plate should be handled by the edges. (b^ig. 69.) This appliesto the handling of the plate at all times, and to the handling of the filmas well. Unless the fingers are wet or greasy, touching the sensitive side *Experieiiccd photographers prefer to handle sensitive plates in ahsolute dark-ness, and soon learn to detect t
. Elementary and dental radiography . hrough the plate just at tJic edge. Whenthe glass side is up one is able to look through the glass and see the filmbeneath. The sensitive side of the plate slnmld present tcnvard thesmooth side of the envelope—awa)- from the seam side. The plate should be handled by the edges. (b^ig. 69.) This appliesto the handling of the plate at all times, and to the handling of the filmas well. Unless the fingers are wet or greasy, touching the sensitive side *Experieiiccd photographers prefer to handle sensitive plates in ahsolute dark-ness, and soon learn to detect the tilm side of the plate hy feeling lightly with thefingers, thus obviating the need of the dark room light when loading plates.—Ed. 70 ELEMENTARY RADIOGRAPHY of the plate is not likely to result in spotting the picture, but it is alwayswell to eliminate as many chances of failure as possible. We are now ready to arrange tube, hand, and plate in their properrelative positions to take the picture. In all radiographic work it must. STA/^O Fig. 70. Showing relative positions of tube, hand, and plate for making a radiograph of the hand. constantly be borne in mind that we are making a shadow picture; thatwe are simply throwing a shadow on the plate, using X-rays as thesource of light. Lay the plate on a stand, sensitive side up. Place the hand on theplate. Adjust the tube at a variable distance directly above the hand.(Fig. 70.) MAKING RADIOGRAPHS 71 The distance from the tube to the hand may vary from about 10 to20 inches, measurements being taken from the target, not from the glassof the tube. It is not necessary to have the target and the plate parallelto one another (in the same plane) as some writers direct. On the con-trary, the position as in Fig. 70 is a better arrangement. Assuming now that the tube is properly hitched to the coil and work-ing properly, we are ready to make the exposure—to take the picture. In giving demonstrations, I find that at this point someone
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