Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 253
possible like the markings on the diatom called Plenrosigmaangulatuin. If the figure is viewed through the eyelasheswith the eyes partly closed, the circles will appear as hex-agons. Fig. 239. … In Fig. 239 is sho\vn a negative reproduction of Fig. 238,in which the 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…
Physics · Lantern projection · Electric apparatus and appliances
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