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 587
of great advantage in all abdom-inal cases. 18. The essential factor for radiographic results is the vacuum ofthe tube; select a seasoned tube so the vacuum and relative pene-tration will not change during the time of exposure. By far shorterexposures must be given where a larger amount of current… … Fig. 4,709.—Suggestion for using X ray tubes: Inverse. At times, in addition to the hemi-sphere of brilliant green fluorescence there will be bands of green fluorescence on the bulbback of the anode, as shown in the illustration at P and parallel with cathode. Thisindicates, either that the tube is…
Electrical engineering
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