Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 623
antern has a central lon-gitudinal slit about three-sixteenths inch wide. This card isinserted in the lantern, and the slit is focused on the screen.An ordinary glass prism is now placed in front of the ob-jective, and turned until the best effects are secured. In Fig. 572 is shown an experiment in… … Double Refraction. screen, and a crystal of Iceland spar is placed between thelantern and the objective. Two images of the aperture ofthe card will appear on the screen, showing that the rayhas been divided or doubly refracted by the spar. A per-manent mounting for the spar may be arranged as…
Physics · Lantern projection · Electric apparatus and appliances
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