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 227
Y The audion is the invention of Dr. De Forest and used only by theRadio Telegraph and Telephone Co., and the valve detector is used onlyby the Marconi Wireless Telegraph Co. Fig. 3,174 shows a diagram of the complete Marconi sending andreceiving system where the valve detector is used with a… … Fig. 3,171.—Inductively coupled tuner or loose coupler. This is practically a receivingtransformer which serves to increase the intensity of wireless signals by varying the pri-mary and secondary coupling. The primary inductance is variable but the secondaryis not, but is withdrawn from the primary…
Electrical engineering
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