Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 480
The Microscope lenses. Concave lens. retina, and the divergency of the raysprevents a clear image being perceived.But if a small lens of a short focallength be placed in front of the eye,having PQ for its focus, the rays oflight will be parallel, or very nearlyso, and will as such produce distinct…
Scientific recreations
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