Prominent physicist (1820-1893) known for his study of diamagnetism and his realms of infrared radiation and the physical properties of air. ALS, one page, 4.5 x 7, blindstamped Royal Institution of Great Britain letterhead, April 9, [no year]. In part: "Many thanks…for your friendly note. The world has been more kind to me in relation to this matter than I could have had any notion of." In fine condition.
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