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 236
r side of the receivers and thedetector stand are connected in series with a battery and rheostat. For sending, a spark coil and key and some source of battery supplyof current are all necessary. The helix may or may not be used forshort distance work, but when there is liable to be government or… … Pig. 3,188.—Wireless recorder outfit. This shows the picture ot a coherer connected to a tele-graph relay. This will close a local circuit when the relay armature is drawn against theinner contact and will operate the telegraph ticker shown or any other apparatus, even tothe lighting of lights or…
Electrical engineering
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