Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 625
vill be seen as continuous lines. A disk of perforated cardboard or tin pivoted centrallyto a plate of the same material, as shown in Fig. 576, exhibits a certain phase of interferencewhen it is placed in the lan-tern and the disk is revolvedslowlv. This is a verv simpledevice, but it is well worth… … Refraction. light beam, to show the effects of intermittent light on mov-ing objects. The slide shown in Fig. 578 is designed to showthe tiring of the eye, bv the observation of a semicircularlight spot on the screen, for a considerable length of time,then quickly prosiding a similar spot, having…
Physics · Lantern projection · Electric apparatus and appliances
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