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 203
he aerial wire A and the oscillating circuit. 2,294 HAWKINS ELECTRICITY This type of detector is more sensitive than the filings coherer form.Instead of using metal filings loosely placed between the conductingplugs, an oxide of lead mixed with glycerine was used for this purpose. Ques. What kind… … Fig. 3,132.—Audion type detector used in the DeForest system. The receiving aerial Ais associated with the audion B, consisting of an evacuated glass bulb containing two elec-trodes, one of which, C, is an incandescent lamp filament receiving current from a lowvoltage storage battery, the strength…
Electrical engineering
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