A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 540
ions are wound on a ring of soft iron, and eachsection is connected directly by wire.s with two of thecommutator-bars. Two conductors, called the brushescorresponding to the springs s and s of Fig. 280, lead thecurrent to the commutator, and take it away after it hastraversed the sections of the… … Fig. 282. at the bar b4, where the second brush touches, go out as onecurrent. If now the magnetic lines of the field in which the arma-ture revolves are horizontal and extend from left to right, itwill be seen, from what is said in § 400, that all the sectionstend to rotate in the same direction,…
Physics
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