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 541
her bodies (such as the poles of a standard cell, §656). Themost valuable instruments of this sort were invented by LordKelvin and may be illustrated by describing two types, the at- 522 ELECTRICITY AND MAGNETISM. traded disc electrometer which serves for comparing potentialdifferences, and the… … FiG. 380. tance, d, which can be accurately measured. A central circularpart, o, of AB is cut out, and while electrically connected withthe rest of AB is movable up and down in the opening, being sus-pended from one end of a balance beam. By means of sightsadapted for the purpose, a can be adjusted…
Physics
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