Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 202
having been set in motion, the mirror isapplied and sounds are uttered in the mouthpiece. Byviewing the reflection of the flame in the revolving mirror,it will appear as if formed of a regular series of pcjintedjets, the persistence of the successive images formed onthe retina causing them to… … ^V^\^ Section of DiaphragmCell. l80 EXPERIMENTAL SCIENCE. the flame is observed directly, but which are clearlybrought out when examined by the revolving mirror. By employing a double mouthpiece, two sets of flamepoints of different lengths alternating with each other maybe shown. Each vowel sound…
Physics · Lantern projection · Electric apparatus and appliances
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