Electricity simplified. The practice and theory of electricity .. (1891)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, N. W. Henley & co. · leaf 92
produce a current. Such a coilis termed an earth coil and an example of one withgalvanometer in the circuit is shown in Fig. 22. The lines of force should vary in intensity fromthe magnetic equator toward the magnetic poles, anda given earth coil rotated at a fixed rate should givedifferent… … Fig. 22.—Earth Coil. On the earths surface matters would be simplifiedif the Amperean currents coincided with the parallelsof latitude. Then the true equator would mark theneutral line or magnetic equator, and the magneticpoles would coincide with the poles of revolution.This is not the case,…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
