Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 408
rgan possesses of seeing at different distances.If we consider it as a dark chamber, there is but onedistance at which an object will be perfectly visible •nevertheless, a metal wire, for example, can be seen aswell at a distance of seven, as ten, fifteen, or twenty inchesby good sights. This… … M Cramers experiment. but by an effort of will the image becomes clear. If,while preserving the clearness of the image, we then carryOUT attention to the second pin, we find that it, too,presents a confused appearance. If we make an effort todistinguish the contour of the second pin, we at…
Scientific recreations
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