British mathematician, astronomer, and inventor (1792-1871) known for his discoveries related to the moons of Saturn and Uranus and for his pioneering work in early photographic processes, including coining the word 'photography' itself. ALS signed “J. F. W. Herschel,” one page, 4.5 x 7, May 18, 1939. Letter to Jonathan Stewart, in part: "I cannot find nor lay my hands on a paper which I wished to transit through you to M. Gaspard…but if you will communicate to him this note it will answer the same end." In fine condition.
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