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Lens

1952 1st plastic lens for cataract patients fitted (Philadelphia) 1948 Dr. Frank G Back (New York City) patents lens to provide zoom effects 1947 1st telescope lens 200" (508 cm) in diameter completed 1947 Lens to provide zoom effects demonstrated in New York City 1936 200" telescope lens shipped, Corning Glass Works, New York-Cal Tech 1897 Alvin Graham Clark, dies 3 weeks after 1st use of Yerkes 40" lens 1706 John Dollond, owner of 1st patent for achromatic lens 1648 Battle of Lens: French duke d'Enghien defeats Spaniards

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