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 224
closer tuning is required than can be obtained with a single contact coil. Adapted towave lengths from zero to 1,500 meters. WIRELESS TELEGRAPHY 2,315 just mentioned are the only forms used commercially which requirelocal battery current to operate them. Galena is very sensitive when a clamped… … Pig. 3,166.—Crystal detector with double adjustment. This instrument is particularly de-signed to readily allow the delicate adjustment of any crystal or mineral. The veryfinest micrometer adjustment can be had by simply turning the hard rubber knob. Ithas two adjustments, one by means of the…
Electrical engineering
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