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 51
bringing near it a bar magnet with some filings attractedto it. The attraction or repulsion between the filings can benoticed at a considerable distance. 41. Magnetic Screens.—Permit a magnet to deflect amagnetic needle from its N and S-position; the deflection isnot altered, if any. non-magnetic… … MA G A /: 7 •]( L\D UCTIOX. 33 net, as shown in Fig. 47. A piece of iron, however, when inter-posed between the nuignet and the needle, acts as a magneticscreen and reduces the deflection of the needle toward the mag-net. A needle, free to move, takes up a position in the earthsmagnetic field with…
Electricity · Magnetism
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