Solar Microscope
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“This consists of two lenses, one of which is called the condesner, because it is employed to concentrate the rays of the sun...The other is a double convex lens, of considerable magnifing power, by which the image is magnified.” -Comstock 1850
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Microscopes and Magnifying GlassesSource
J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 251
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