Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 425
eachlayer; nevertheless every strip appears darker at theedge touching a more transparent layer, and lighter atthe edge in contact with a thicker layer. The dull tintsof China ink, superposed in layers, will produce a similareffect. The phenomena are produced by means of rotativediscs of most… … DisC; which exhibits, when in rotation, a series of concentric rings. that becomes darker and darker towards the centre. Theangular surface of the dark portions is constant in eachof these rings. The intensity, therefore, of each ring isuniform during rapid rotation ; it is only between onering and…
Scientific recreations
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