Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 389
tes 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 breakage by the fallingof the mercury against the end of the tube, and at the sametime… … FRICTIONAL ELECTRICITY. 367 cur}-. The inner tube is sealed to the outer tube near oneend, and in the inner tube, a short distance above this seahng,is formed an aperture which determines the amount of mer-cury to be retained between the inner and outer tubes whenthe tube is inverted preparatory to…
Physics · Lantern projection · Electric apparatus and appliances
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