Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 400
hen the dis-charge rods are near together, is shown in Fig. ^O^a. The report of the discharge is increased when a rubberplate is held between the rods, as in Fig. 366, the sparkjumping over the edge of the rubber through an increaseddistance. Thick cardboard placed in this position is… … Diversion of the Discliarge by Moisture. coat of thick shellac varnish or other suitable cement, and isthickly sprinkled with brass or iron filings before the varnishbegins to dry. When the varnish is thoroughly dry, a bandof tin foil is pasted across opposite ends of the glass. Whenopposite ends…
Physics · Lantern projection · Electric apparatus and appliances
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