Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 350
^ of the magnetic field re-turns again to the circuit Electricity tray els at the rate of186,400 miles per second, and these waves are also propagated … Fig. 301.—Connections for Three Telegraph Stations Using Relays.One traDsmitting wire is used and a ground return. at this speed. There are also about 230 million wayesradiated per second. To propagate these wayes with the bestresults from an induction coil, the secondary terminals areconnected to…
Electricity · Magnetism
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