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 579
, specially prepared X ray plates with double coating should beused. 2. Very rapid plates have not the same advantage over medium orslow plates as they have in ordinary photography. X RAYS 3,233 3. Stored plates must never be kept near the X ray room or evenwithin 20 feet of the same unless kept in… … * rBes i x-My treat**13 X Fig. 4,695.—Hulton inductance switch. Every point on the inductance represents a distinctvalue in the secondary voltage from the coil by changing the ratio of the primary turnsof wire to the secondary. The connections are made so that the markings on the dialrepresent the…
Electrical engineering
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