. Dental radiology . \H- Fig. 15. Fig. Elongation Oj 100 You will note first that it is very much enlarged, andsecondly, the outline will be faint and indistinct. Now slowlyapproach the screen with your hand. You will observe thatthe shadow becomes more distinct and smaller, till at length,when the hand is almost touching the screen, the shadow willbe good and black, and of almost the exact size of the actualhand. From this experiment, we learn that in radiography thecloser we get the plate or film to the tissues we wish to show,the clearer and sharper will the res
. Dental radiology . \H- Fig. 15. Fig. Elongation Oj 100 You will note first that it is very much enlarged, andsecondly, the outline will be faint and indistinct. Now slowlyapproach the screen with your hand. You will observe thatthe shadow becomes more distinct and smaller, till at length,when the hand is almost touching the screen, the shadow willbe good and black, and of almost the exact size of the actualhand. From this experiment, we learn that in radiography thecloser we get the plate or film to the tissues we wish to show,the clearer and sharper will the resulting picture be. Let us refer to Figure 14, which represents a man standingon a sidewalk at night, with an arc lamp directly over his arc lamp is represented by A. The direction of the raysof light by AD, and the shadow of the man cast upon the walkas BC. When the source of light is directly over the man theonly shadow that is thrown at all is a small spot directly athis feet. Now suppose that the man takes a step forward andassumes th
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