Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 388
65 Upon gathering all of the free ends of the threads to-gether, the repulsion of the threads at their mid-lengthcaused them to separate widely. When once electrified, ina dry day, the threads retain the charge for hours. Theyare discharged by connecting them with the ground throughthe body, and… … Self-exciting Geissler Tube. The self-exciting vacuum tube, shown in Fig. 353, oper-ates in the same manner. The electrical effect is producedby the friction of mercury on the inner surfaces of the vacu-ous glass tube, as the tube is inverted or shaken. The tubeis ingeniously contrived to prevent…
Physics · Lantern projection · Electric apparatus and appliances
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