Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 180
ops in one wire will be at their height at A and C, at the moment when the waves in the other wire are at their heights at B and D. These waves chase each other around the ring, keeping perfect step, at a distance of one quarter the circle, or 90°. This can be proved by adjusting a magnetic needle…
Electrical engineering
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