British chemist and physicist (1832-1919) who was a pioneer of vacuum tubes and invented the Crookes radiometer. TLS, one page, 4 x 6.25, personal letterhead, July 22, 1890. Letter to M. L. Olivier in Paris, in part: "I am not able to tell you the exact days on which the Physical and Chemical Societies meet after the vacation, but they will be quite early in November." In fine condition.
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