. Elementary and dental radiography . Fig. 56. High-frequency X-ra^- Fig. High-frefiuency X-ray tulie. out from the tube in every direction intersecting the direct rays. Second-ary rays are also given off from any object which X-rays strike. Thus,direct rays will strike a wall; secondary rays are given oft from the walland strike the other walls, the floor, and the ceiling, whereupon a newset of X-rays, tertiary rays, are produced. When the tertiary rays strikean object still another set of X-rays are generated, and so on, each newset of rays being much shorter and weaker than the forme
. Elementary and dental radiography . Fig. 56. High-frequency X-ra^- Fig. High-frefiuency X-ray tulie. out from the tube in every direction intersecting the direct rays. Second-ary rays are also given off from any object which X-rays strike. Thus,direct rays will strike a wall; secondary rays are given oft from the walland strike the other walls, the floor, and the ceiling, whereupon a newset of X-rays, tertiary rays, are produced. When the tertiary rays strikean object still another set of X-rays are generated, and so on, each newset of rays being much shorter and weaker than the former. So a roomin which an X-rav tube is excited is tilled with X-rays—not with thedirect rays but with the com])aratively feeble and inconsequential sec-ondarv, tertiary and other suliordinatc raxs. 58 ELEMENTARY RADIOGRAPHY X-ray tubes are of different sizes. The bulbX-Kay tubes. varies in diameter from five to eight inches. Thus we have the five-inch tube, six-inch tube, and so six-inch tube is about right for dental work. With use the glass of the active hemisp
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