Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 101
all with headsin the air waiting for the irtip to appear. A card, suchas the ace of hearts, may replace the design, and insteadof the ceiling, a sheet of white paper may be looked at 84 LIGHT. after the figure has been studied. This experiment canbe varied to any extent—a white, black, or green… … Fig. 7i.—The Mule Rigolo. THE MULE RIGOLO. We have seen on the boulevards a very simple zoo-troptic apparatus represented in the cut above (Fig. 71).It is composed of four panels of cardboard, mounted ata right angle around a hollow axis. This cardboard PERSISTENCE OF IMPRESSIONS ON THE RETINA. 85…
Scientific recreations
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