Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 482
oscope has graduallyattained perfection. We have so frequently mentioned lenses that it maybe as well to say something about them. Lenses maybe spherical, double-convex, plane-convex, plane-concave, LENSES. I 2 5 double-concave, and concave-convex. Convex lenses bringthe parallel lines which strike… … Hypermetropia (long sight). F in the diagram. But converging rays falling on itemerge in a parallel direction as on page 123, or divergeas in the second illustration on page 124. The use of spectacles to long or short-sighted peopleis a necessity, and the lenses used vary. The eye has
Scientific recreations
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![An illustration from Common objects of the microscope [electronic resource] (1900)](https://img.insideoutlibrary.com/img/200/ia-49492157.2969.emory.edu-28-11.webp)
