Practical radiography : a handbook for physicians, surgeons, and other users of X-rays (1901)
Isenthal, A. W, Ward, H. Snowden (Henry Snowden), 1865-1911 · London : Published for The Photogram, Ltd. by Dawbarn and Ward, Ltd. · leaf 183
infinity (parallel rays) we would obtaintrue outlines. We must thus only employ the parallel rays, i.e.,exclude for our examination all the rays emitted from theanti-cathode with the exception of the one at right anglesto the screen. This we effect by constantly altering theposition of tube and… … Fig. 78. fixed to the lower and upper horizontal bar, respectively,of a 33 frame, which moves easily (by means of rollers) inall directions in a horizontal plane; the sighting arrange-ment consists of a small ring of lead (20) below the fluor-escent screen, which by means of a small pendulum with…
Radiography · X-rays
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