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 226
s together and serve to magnetize the revolv-ing steel band but this is destroyed (by wireless waves (and a clicking of the receiver dia-phragm is the result. Ques. What are the characteristics of the valve andthe audion detectors? Ans. They are very sensitive and retain their sensitivenesseven… … Fig. 3,169.—Crystal detector. When the hard rubber knob at the top of the detector standis turned, the needle point, which presses into the crystal is moved up or down. Thisallows of a variable adjustment which may be tight or loose, as desired. The springshown helps to push the crystal up against…
Electrical engineering
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