Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 625
r period or 90°, and so a system using such currents iscalled a quarter phase system. Fig. 465 shows the phase of two / / ^ f ^ \ \ \ \ / & \ / / \ \ . f \ X / > y^- ^ Fig. 465. such currents. Fig. 466 represents the phase relations of the threecurrents, where the phase difference is 120°. A… … Fig. 466. are the same as with single phase alternating currents, that is60 alternations per second for ordinary conditions, with as lowas 25 for power purposes alone. As already explained the com- INDUCTANCE, 607 mercial machines are always multipolar for mechanical reasons. The advantage of two…
Physics
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