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 140
juriousnature that duplex and quadruplex telegraphy (especially the latter)would be impracticable. THE TELEGRAPH 2,233 Ques. Explain the use of the retardation coil. Ans. It is employed to retard and diminish the condensercharge and discharge to conform more closely to the actualconditions in the… … Fig. 3,081.—Bunnell adjustable telegraphic condenser showing 4, 8, 16, 32, and 40 per cent,peg adjustment. The interior construction consists of a number of sheet of tin foil inter-leaved with insulation, usually mica. As connected in the duplex system alternate leavesare connected with the…
Electrical engineering
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