A handwritten notebook that belonged to the celebrated World War II code-breaker Alan Turing has sold in the US for more more than $1m
The 56-page journal, written in a simple notebook bought from a stationers in Cambridge, was sold at an auction on Monday for $1,025,000. The identity of both the seller and buyer have not been released.
The journal, which has never before been seen in public, dates from 1942-44 and covers the period when Turing was working at Britain’s Bletchley Park to break the German Enigma Code.
The auction house Bonhams said the journal provided a remarkable insight into the thought processes of the mathematician and computer science pioneer. It was among papers left by Turing to his close friend and fellow mathematician Robin Gandy, who wrote a dream journal in the blank centre pages.
The effort of Turing and a team of cryptanalysts to break the code inspired the 2014 film The Imitation Game, starring Benedict Cumberbatch in the role of Turing.
Cassandra Hatton, a spoeswoman for Bonhams, told The Independent, she did not believe the film had increased the value of the document, even though it had shared Turing's story with the broader public.
"The buyer already knew about Alan Turing," she said.
The Associated Press said that in one part of the journal, Turing turns his attention to a complex calculus notation.
“The Leibniz notation I find extremely difficult to understand in spite of it having been the one I understood the best once,” he wrote.
“It certainly implies that some relation between x and y has been laid down eg, y(equals)x2+3x.”
In addition to the notebook, Bonhams was also offering for sale a working German Enigma enciphering machine. The three-rotor device was manufactured for the German military in July 1944 and sold for $240,000.
Turing was prosecuted for being gay at a time when it was illegal in Britain. He was convicted of indecency in 1952 and agreed to undergo hormone treatment as an alternative to imprisonment to “cure” his homosexuality.
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Gandy gave the papers to King’s College in Cambridge in 1977. But he kept the notebook, using its blank pages for writing down his dreams at the request of his psychiatrist. Bonham said Gandy’s entries were highly personal. The notebook remained in his possession until he died in 1995.
In the journal, Gandy writes: “It seems a suitable disguise to write in between these notes of Alan’s on notation, but possibly a little sinister; a dead father figure, some of whose thoughts I most completely inherited.”Reuse content