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 63
lines. They correspond with the meridiansof longitude, but are also irregular. Such maps are preparedfrom time to time by the United States Geodetic Survey, andare used in determining localities, especially in connectionwith the mariners compass on board ships. 54. The Mariners Compass.—In small… … EARTHS MAGNETISM. 45
Electricity · Magnetism
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