Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 587
two or three coats ofshellac varnish to a smooth pine board, allowing it to be-come thoroughly dry, then applying the tinfoil and causingit to adhere by passing over it a warm sad-iron, which melts Fig. 545. … sst Word formed by Sparks. the shellac so that as soon as it becomes cool the foil isfirmh- cemented to the board. The squares are formed bycutting through the foil longitudinally and transversely bymeans of a sharp knife guided by a straight edge. In Fig. 545 is shown a word formed by sparks…
Physics · Lantern projection · Electric apparatus and appliances
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