This ts letter from Arthur Koestler was sent to Dr Thomas Kovari (Kövári Tamás) who had escaped from Hungary in 1956. The letter to 'Dear Mr. Koevari' - indirectly described by Koestler as a fan - was written from the Berghotel 'Böglerhof', Alpbach, in the Tyrol, Austria, on 2 July 1959. It is signed in Koestler's hand. Koestler thanks Mr. Koevari for the trouble he has taken to point out a passage... a 'howler'.
Although the title referred to is un-named, it is The Sleepwalkers, a history of man's changing vision of the universe, published in 1959 (London: Hutchinson).
The letter states: 'The formulation on page 506 was indeed very careless'. It goes on...: 'The "spiral" was meant metaphorically, referring to a meteor entering the earth's atmosphere [...]'. Koestler tells Mr. Koevari that he hadn't noticed 'an even more striking howler on page 394'.
In addition to the very large collection of Papers of Arthur Koestler (Coll-146), there are also: Papers of Iain Hamilton built around his work on Arthur Koestler (Coll-1479); and, Correspondence and copy letters between Arthur Koestler and publisher Victor Gollancz and others, 1941-1990, and relating specifically to 'Spanish Testament, 'Scum of the Earth', and 'Reflections on Hanging' (Coll-1745)... but check the mss catalogue for other materials too.
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Typescript letter from Arthur Koestler to Dr. Thomas Koevari. Edinburgh University Library Special Collections. http://lac-archives-live.is.ed.ac.uk:8081/repositories/2/resources/86215 Accessed July 07, 2020.