Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 46
m at180°, and the needle points in the direction of B. At the 180° point of the cycle, b reverses in direction and pro-duces a negative pole at D, and as the fluctuation of the pressureof the two currents during the second half of the cycle, from180° to 360°, bear the same relation to each other as… … FiG. 1,684.—Moving picture method of showing motion of a rotary magnetic field. A numberof sheets of paper are prepared, each containing a drawing of the motor frame and amagnetic needle in successively advancing angular positions, indicating resultant directionsof the magnetism. The sheets are…
Electrical engineering
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