Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 587
branches, eachof which resembles a miniature lightning stroke. The dis- … Janneys Lightning Board. charge from a coil like that just described will readily passover such a board six feet in length. The best method ofmaking this apparatus is to appl} two or three coats ofshellac varnish to a smooth pine board, allowing it to be-come thoroughly dry, then applying the…
Physics · Lantern projection · Electric apparatus and appliances
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