Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 431
which are then horizontal and 74 OPTICAL ILLUSIONS. vertical. The direction of the vertical and horizontallines is less modified than that of the oblique lines. Wemay look upon these latter illusions as fresh examples ofthe aforesaid rule, according to which acute angles clearlydefined, but of… … The vertical strips are parallel ; they appear convergent or divergentunder the influence of the oblique rays. sides appear to diverge, the experiments will result inillusions given. On page 73 the two halves of each of the two straightlines .seem to deviate through the entire length in such…
Scientific recreations
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