Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 465
point of meeting the vision isindistinct, but the angle of convergence is always variedaccording to the distance of the object. If we hold tip apenholder in front of us, and in a line with any otherdefined object,—say an ink-bottle,—we can see the pen-holder distinctly, and the ink-bottle… … The Sterco-.cope. well, but the right eye will see a little more on its rightside and the left eye on the left. It is on this principlethat the Stereoscope is constructed. Sir Charles Wheat-stone was the inventor, and the instrument may be thusdescribed :—Two pictures are taken by photography—one…
Scientific recreations
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