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 53
stthe 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 lieavv 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
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