Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 443
r bv means of wooden strips—previously boiled in paraffine—and rubber bands. Thestrips are placed on opposite sides of the series of plates atthe top and bottom, and the rubber bands extend length-wise of the strips. The arms of each series of plates are bent so as to bringthem together about 3 or… … Plates Connected. This element is placed in a glass cell, on paraffined trian-gular wood supports, and the formation is proceeded with. To hasten the process, the cell is filled with dilute nitricacid (nitric acid and water equal parts by measure), whichis allowed to remain for twentA-four hours.…
Physics · Lantern projection · Electric apparatus and appliances
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