With regard to the antiquity of the lens the author [Edouard Fourdrignier in an article in Photo Club de Paris] says: "If we are to believe C. P. Gaubil, quoted by M. De Paravey in his 'Chronologie Chinois,' the Emperor Chan, who reigned 2283 B. C., used enlarging lenses in the form of a telescope in order to be able to get a better view of the planets."
Anonymous, "Antiquity of the Lens," Scientific American, vol. 69, no. 7 (August 12, 1893), p. 104.
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