Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 407
Ifplaced nearer at RR, or further off at RR, the lightfrom the object is thrown on the screen, and the image isconfused. To prove the imperfection of sight which isshown by the application of these theoretic rules, MM. 50 VISION. Boutan and dAlmeida * cite the following experinment:—If the head of… … Diagram of mode of vision. be placed to be plainly perceived. This distance, whichaverages fifteen inches, varies with different individuals.It can be determined for different sights by means of anapparatus constructed by Lepot. A white thread, a, isstretched horizontally on a dark board. We look…
Scientific recreations
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