Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 442
f yi inches. Each plate is providedwith an arm i!; inches wide and of sufficient length to formthe electrical connections. The plates are cut from sheetlead in the manner indicated at 3, in Fig. 413, /. r., twoplates are cut from a sheet of lead 8AX14 inches. Thismethod of cutting effects a saving… … Roughening the Plate. medium fineness is driven into the surface of the lead bymeans of a mallet. To avoid breaking the file, its temper isdrawn to a purple. After the plate is roughened on oneside, it is reversed and treated in the same way upon theopposite side. If a knurl is available, the…
Physics · Lantern projection · Electric apparatus and appliances
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