Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 575
es havinga somewhat higher vacuum than is usually employed for the production of cathode rays. X RAYS 3,229 X rays are produced whenever the cathode stream is arrestedby the walls of the tube or metallic objects therein. Ques. What is the cathode stream? Ans. This is believed to be a discharge of… … ^yrmr Fig. 4,690.—Single focus X ray tube. This is the simplest form of single focus tube designedfor limiting the X ray radiations to a point source, thereby obviating the necessity ofplacing an object far from the tube when the former cannot be brought close to a fluorescentscreen. In other words…
Electrical engineering
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