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
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… … Fig. 3,170.—Electrolytic detector invented by Fessenden. It is probably the most sensitiveof all detectors excepting the audion and the valve detectors. It consists of a carbon cupconnected to a binding post and an adjustable standard which holds a very small hair-likeplatinurn wire which dips into…
Electrical engineering
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