Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 350
asing current inany circuit we consider electric oscillations of very highrapidity, as the discharge of an induction coil, then part ofthe energy of the magnetic field is radiated off into space inall directions as electromagnetic waves corresponding to theripples on the surface of a pond wThen a… … Fig. 301.—Connections for Three Telegraph Stations Using Relays.One transmitting wire is used and a ground return. at this speed. There are also about 230 million wave*radiated per second. To propagate these waves with the besiresults from an induction coil, the secondary terminals areconnected to…
Electricity · Magnetism
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