the slide receiver. representing ether particles, will be seen to move up causes radiometer to revolve, so that it is seen in and down on the screen without advancing, but the In Fig. 14 is shown some curious effects of refraction. motion on the screen. waves formed by the dots move on. A portrait… … THE OPEIDOSCOPE. This tank is formed of two plates of glass and a seg- ment of a fruit jar packing ring. If one ring is not small piece of mirror is cemented to the center of the thick enough, two rubber. may be used. The The perforated card shown in the corner of the en- LUMINOUS FOUNTAIN. rings…
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