The principles underlying radio communication (1922)
United States. National Bureau of Standards, Ould, Richard Sheldon, 1889-, United States. Army. Signal Corps · Washington, Govt. Print. Off. · leaf 105
s in a detinite direction at a givenposition. These direction lines, called magnetic lines offorce, all appear to center in two points near the ends of thebar magnet. These points are called the poles of the mag-net. Two magnetic poles are said to be alike when they bothattract ()r botli repel the…
Telegraph, Wireless · Radio
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