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
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… … Fig. 3,167.—Double Crystal detector. Two crystals in contact often form a very sensitivedetector, especially if one be an inactive substance and the other sensitive. This is thefeature of the perikon detector. Carbon and carborundum may be used in this de-tector stand. 2,316 HAWKINS ELECTRICITY U.…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
