Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 77
Torsion Pendulum. The Balance. The principle of Hookes invention is illustrated by Fig. 40.The apparatus here shown has a vibratory period of onesecond. The staff rests at the bottom in a small porcelainsaucer and turns at the top in a wire loop secured to thebase board. The disk on the staff is…
Physics · Lantern projection · Electric apparatus and appliances
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