Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 280
medof lampblack and alcohol, in whichonly a trace of shellac has beendissolved. The tubes may have any suitablediameter, and the proportions of thedoubler may be about the same asindicated by Fig. 266, which is one-quarter actual size. The tubes andlenses shown in Fig. 267 are one-halfsize. The…
Physics · Lantern projection · Electric apparatus and appliances
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