Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 430
vertically upthrough a hole in a card, and sprink-lino iron filintrs from a muslin bao; onthe card. If tlie card is gently tappedwliile a strong current is passingthrougli the « wire, the filings / ^ a; v arrange them- /^^ ^ ^§i-\selves in con- / i^^, \ centric rings H about it. (Fig. 501.) If a… … Fio. !501.—The presence of a mag-netic field about a wire carryingan electric current shown byaction on iron filings. Fio. 502. —The presence of amagnetic field about a wirecarrying an electric currentshown by the action on acompass needle. 420 MAGNETIC RELATIONS OP THE CURRENT
Physics
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