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 574
cover, which transmits none of the ultra-violet rays of the sun or of theelectric arc. I found by experiments that all bodies are transparent to this influence, althoughin very different degrees. 3,228 HAWKINS ELECTRICITY Ans. A vacuum tube, a battery, and an induction coil withinterrupter. Ques.… … Fig. 4,689.—Old form of Crookes tube illustrating the production of X rays. \ The anode Aand the cathode C, are aluminum plates cemented on the ends of iron or copperrods sealed in the glass bulb B. S is the seal off tube, which is closed after the bulb hasbeen exhausted of air to the desired…
Electrical engineering
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