Davidson, James Mackenzie, Sir, 1856-1919 · New York, P.B. Hoeber · leaf 26
having the finest focus. Another method to the same end, with a resultperhaps not quite so obvious, is to replace the crosswire with a plate of lead in which a very fine pinholeaperture has been made with a needle. If this pin-hole occupies the middle position between the anodeand the screen (or a… … Fig. 4.—Stereoscopic View of X-Ray Tube with Wire Cross in Position.
X-rays · Eye · Foreign bodies (Surgery)
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