X rays, an introduction to the study of Röntgen rays (1914)
Kaye, G. W. C. (George William Clarkson), 1880-1941 · London : Longmans, Green · leaf 245
the plan of repeatedlyabstracting and isolating, by means ofa solid or liquid piston, a certainfraction of gas from the vessel to be exhausted, anddelivering it elsewhere. The exception is a strikinglyingenious molecular pump recently introduced by Gaede.2 1 As a practical precaution, a plug of… … Fig. 97.—Tube contain-ing charcoal immersed inliquid air. APPENDIX III 223 It depends for its success on the viscous dragging of gasby the surface of a cylinder rotating within a secondcylinder at a speed comparable with the velocities of themolecules of the gas, which are accordingly impoverished…
X-rays
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