Christie, Arthur Carlisle, 1879- · Philadelphia ; London : Lippincott · leaf 27
pposite end of the tube, theanode being ring-shaped so as not to obstruct thepassage of the rays. 13 14 A MANUAL OF X-RAY TECHNIC A great advance was made when Herbert Jacksondevised a tube with a metallic target fixed within it ator near the focus point of the cathode stream (Fig. 8).This * focus… … Fig. 7.—Early type of R6ntgen-ray tube. has been exhausted by means of mercury pumps toabout one-millionth of an atmosphere. The essentialparts of the tube are the cathode, the anti-cathode ortarget, the accessory anode, and some device to regu-late the vacuum (Fig. 9). The cathode of a focus tube…
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