X rays, an introduction to the study of Röntgen rays (1914)
Kaye, G. W. C. (George William Clarkson), 1880-1941 · London : Longmans, Green · leaf 90
he pressurebecomes very low. A valve-tube is only efficient over alimited range of pressures. The Wehnelt valve-tubeemploys a hot-lime cathodesuch as is described on p. 8.Such a tube, in series with anX-ray bulb, will transmit, from the cathode to the anode,only the negative phase of the discharge… … Fig. 43.—A multiple valve-tube. CHAPTER VI. THE HARDNESS OF AN X-RAY BULB. Factors controlling the Hardness of an X-ray Bulb. The hardness of the X rays produced by a bulb is mainlydependent on the maximum potential difference between theelectrodes. There are a number of ways of controlling…
X-rays
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