British astrophysicist (1882-1944) famous for his work regarding the theory of relativity, remembered for his observations of bending starlight during the 1919 total solar eclipse that offered experimental proof of Einstein's theory. TLS signed “A. S. Eddington,” one page, 8 x 13, Royal Astronomical Society letterhead, January 14, 1916. Standard form letter to Dr. Ludwik Silberstein, announcing his election as a member of the Royal Astronomical Society. In part: "I have the pleasure to inform you, that you have this day been elected a Fellow of the Royal Astronomical Society. The Bye-Laws relative to new Fellows, with which it is expedient that you should be more immediately acquainted, will be found on a subsequent page." Printed on the integral leaf are extracts from the organization's bye-laws pertaining to the election of fellows, admission fees, and annual contributions. In fine condition, with light horizontal creasing, and toning and soiling to borders.
From the collection of physicist Ludwik Siberstein.