Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 429
This illusion, which is sure to occur inestimates of this kind, can be demonstrated by numerousobservations. M. Helmholtz has also indicated several optical illu.sions. If we examine the diagrams below, the continuationof the line a does not appear to be d,—which it is inreality,—but f, which is a… … Experiment in optical illusion. where they appear so, but are not in reality. If we drawthe figures as at A, leaving out the line d, and look atthem from a gradually increasing distance, so that theyappear to diminish, it will be found that the fartheroftthe figure is placed, the more it seems…
Scientific recreations
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