Harmsworth, Alfred Charles William, Sir, bart · London Bombay : Longmans, Green, and Co. · leaf 326
ne kind where the current enters, and another double pole of theopposite kind where the current goes out. If the brushes bearranged to slip from one coil of the wire w to another, then if thewhole wire-wound ring c be turned round, the magnetic poleswill remain constant in space, although the ring… … Fig. 3 on the other pair of poles in the opposite direction. Now theposition of these poles in space is permanent, and dependsupon the position, as already explained, of the brushes band B^ The result is that perpetual rotary pull or torque isproduced in the ring and it turns round. The amount…
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