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 53
nstthe action of the bar magnet. If a compass needle wereplaced in the centre of a thick iron sphere it would beentirely screened from any external magnetism. This prin-ciple is utilized in the manufacture of heavy cast-iron boxes3 34 PRACTICAL ELECTRICITY. for measuring instruments which are to be… … Fig. 48.—Needle Screened from Magnet by a Magnetic Body. the spring become magnetised the watch generally runs slow,due to the force of attraction between the poles of the spring.Non-magnetic bodies are employed in the springs of non-magnetic watches. QUESTIONS. 1. Cite and illustrate by sketches…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
