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 510
the declination at theplace. That at Washington is now about 4.5° west. 565. The Intensity. The intensity / of the earths field atany point is measured like that of any other field, namely bythe force in dynes acting on a unit pole. For many pur-poses it is useful to refer the total magnetic… … 492 ELECTRICITY AND MAGNETISM. will represent the horizontal component H, and the vertical com-Q ^ ponent V respectively, 8 being the angle
Physics
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