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 563
s field the resulting field may beadjusted to any desired strength. Another function of the con-trol magnet is to enable the instrument to be used in any position. The mirror M referred tois very small and light, some-times only a few millimetersin diameter. It is usuallyattached to the system… … Fig. 404. D ARSONVAL GALVANOMETER. 545 through by the system can be calculated, the latter being half as great asthe deflection of the beam of light (§ 390). Fig. 404 will make the methodclear. AB is a graduated scale well lighted. M is the mirror, its equilib-rium position being parallel to the…
Physics
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