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 631
mercury cups, and thewire frame is thus free to rotateabout a vertical axis through ab. The force of rotation between coils is used in the electrodynamometerfor measuring currents. Fig. 477 shows the Siemens form of theelectrodynamometer. The coils are kept at right angles to each other byputting… … Fig. 476. ELECTRODYN AM ICS. 613 of the current, and the oppos-ing force of torsion is pro-portional to 6, the angle oftorsion. Hence we haveP = k0, or / — ky/J, where^ is a constant to be deter-mined for each instrument.This instrument is adaptedto the measuring of both di-rect and alternating…
Physics
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