Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 216
meansof ensuring this accurate repetition. Condition of the Tube.—In the chapter on Tubes it wasstated that there is considerable discrepancy between the actionof different kinds of rays on a fluorescent screen and their actionon a photographic plate, a hard tube not acting on the plate sorapidly… … RADIOGRAPHY. 175 a fairly sharp negative may be produced with great latitudeof exposure. Nevertheless, expert workers generally use much hardertubes, and yet get very beautiful results. If a hand be examined with a soft tube and a screen, a goodblack shadow is seen of the bones, strongly contrasted…
X-rays
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