The young folk's cyclopædia of games and sports ; (1899)
Champlin, John Denison, 1834-1915, Bostwick, Arthur Elmore, 1860-1942, joint author · New York, H. Holt and company · leaf 312
d then rotate it be-tween the eye and a cloudy sky.The sky will gradually assumedifferent tints which vary -with thespeed of the disk. None of thesecolors are real, but caused by the ex-citement of the optic nerve by a rapidsuccession of darkness and light. 13. Cut in a piece of cardboardtwo square… … EYES 304 EYES elastic bands. Buy of an opticianwhat is called a double-refractingprism, a piece of Iceland-spar orcalc-spar which makes objects seenthrough it appear double. Hold thecard up to a wmdow or lamp andlook through a prism at it. Eachcolored hole will appear double, andby holding the…
Games · Sports · Card games
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