Davidson, James Mackenzie, Sir, 1856-1919 · New York, P.B. Hoeber · leaf 50
w. When this arrangement is placedupon the couch, and the tube is excited in a darkenedroom, the shadow of the small plumb-bob and of thecross wires will be visible on the screen, and the boxcan be readily moved to such a position that theshadow of the plumb-bob is directly below the pointwhere the… … Fig. 17.—The Wheatstone Stereoscope. To facep. 16. X-RAY STEREOSCOPY 17 shadow must be vertically below the cross wires,and it is only necessary then to adjust the arm attachedto the perpendicular support so that the plumb-bobmentioned in the preceding paragraph as being sus-pended from this arm…
X-rays · Eye · Foreign bodies (Surgery)
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