Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 453
ICAL ILI,USIONS. after having fixed our eyes for two or three minutes ona rushing waterfall, if we suddenly turn our glance on theadjacent rocks, the latter appear to move from top tobottom. It is not a question here of the effect of therelative movement to be observed on regarding simul-taneously… … Experiment on complementary colours. there is no simultaneous comparison , the eyes are turnedsuccessively first on the water, and then on the rocks.In a rapid river, such as the Rhine above the fall atSchaffhausen, the stream is not equally swift in everypart, and the current is noticeably more…
Scientific recreations
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