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 578
t. a sharply defined shadow, the screen should be held close as possibleto the source of X ray, and the hand close to the screen. Ques. What is a radiograph? 3,232 HAWKINS ELECTRICITY Ans. A picture taken upon a photographic plate by means ofX rays. The picture is usually of an opaque object… … Fig. 4,694.—Scheidel-Western third terminal on radiographic special coils. The third terminalis for regulating the vacuum in X ray tubes, which is accomplished by moving a cord reelthat is connected to the regulating bulb of the tube either to or from the negative or posi-tive pole as desired. This…
Electrical engineering
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