Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 280
Compass needle deflected by an electric current bornein a wire. ELECTRICITY 231 trical measurement. He observed that when an electric current ispassing through a wire, a nearby magnetic needle tends to placeitself at right angles to the wire, the deflection varying with thestrength of the current.… … Compass needle deflected by an electric current bornein a coil. employed simple compass needles; these proved to be unsatis-factory. They were affected by the variations which occur in theintensity of the earths magnetism; and no matter how carefullya needle was made, it varied in strengthfrom week…
Inventions · Inventors
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