Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 254
e spots are white on a black ground. Whenthese figures are compared, the white spots, on account of LIGHT. irradiation, appear much larger than the black ones, althoughthey are of exactly the same size. Fig. 240 illustrates an interesting illusion observed by Mr.J. Rapieff, the well known… … Rapieffs Optical Illusion. loops used in the experiment, while the upper figures repre-sent the effects produced. The wire has a polished surface.When the single semicircular loop is twirled, the only effectis to produce a gauzy glimmer of spherical form, as shownin the upper right hand figure.…
Physics · Lantern projection · Electric apparatus and appliances
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