Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 151
water-pump or a mechanical air-pump, which removes most of theair in a minute or so. When the gauge shows that a good 120 PRACTICAL X RAY WORK. vacuum has been formed, A is drawn off, and the tube sealedat M. The mercury-pump now comes into action, and thefocus tube is tested from time to time by… … r^\ Fig. 41.—Water-pump. Fig. 42.—Method of attachingFocus Tube to Air-pump. useful in the earlier stages, but later on a Bunsen burner shouldbe used, applying the flame directly to the tube, but keeping itconstantly moving so as to avoid cracking or softening the glass. To judge of the resistance…
X-rays
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