Davidson, James Mackenzie, Sir, 1856-1919 · New York, P.B. Hoeber · leaf 64
o it,and a screen be placed over this little apparatus, thescreen, when illuminated, will show—if the previousadjustments have not been disturbed—that the shadowof the foreign body is exactly vertically below theintersection of the cross wires. The tube-box is thendisplaced by 10 cm. to the left of… … Fig. 21.
X-rays · Eye · Foreign bodies (Surgery)
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