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 185
be and screen areseparated as shown in Fig. 82.The tube is first orientated to amedium position with respectto the foreign body, and thendisplaced to the right. As aconsequence the shadow of thebody shifts to the left, and thelead index must be moved untilit is in register with the shadow; both… … Fig. 81. X = j- x d (where b = displacement of index on screen). (4) If the bodies lie side by side, we employ method(2); if one above the other, then method (3) has to betwice followed, and the results subtracted. The decree ofaccuracy obtainable is from 1 to 4 per cent. Plate XL]
Radiography · X-rays
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