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British Code Breaker Alan Turing's Notebook at Auction

In this March 19, 2015, file photo, a page from the notebook of British mathematician and pioneer in computer science Alan Turing, the World War II code-breaking genius, is displayed in front of his portrait during an auction preview in Hong Kong.

NEW YORK (AP) — A handwritten notebook by British World War II code-breaking genius Alan Turing is expected to bring at least $1 million at auction in New York.

The 56-page manuscript was written at the time the mathematician and computer science pioneer was working to break the seemingly unbreakable Enigma codes used by the Germans throughout the war. It contains Turing's complex mathematical and computer science notations, and is believed to be the only extensive Turing manuscript known to exist, according to Bonhams, which is offering the manuscript for sale on Monday.

The story of how Turing and a team of cryptanalysts broke the code was portrayed in the 2014 movie, "The Imitation Game," starring Benedict Cumberbatch in the role of Turing.

The notebook dates from 1942, when they were at Britain's World War II code and cypher school Bletchley Park. In one entry, Turing writes about 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! It certainly implies that some relation between x and y has been laid down eg, y=x2+3x."

The sale also includes a working German Enigma enciphering machine. The three-rotor device was manufactured for the German military in July 1944. It's estimated to sell for $140,000 to $180,000.

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.

He died in 1954 of cyanide poisoning. It was ruled a suicide although his family and friends believed it might have been accidental. The notebook was among the papers he left in his will to friend and fellow mathematician Robin Gandy .

Gandy gave the papers to The Archive Centre at 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 describes Gandy's entries as highly personal; the notebook remained in his possession until he died in 1995.

At the beginning of his 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."

In a statement through Bonhams, Turing scholar Andrew Hodges said the notebook sheds more light on how Turing" remained committed to free-thinking work in pure mathematics."

The Imitation Game, which also stars Keira Knightley , is based on Hodges' book Alan Turing: The Enigma.

Bonhams said the seller wished to remain anonymous. Part of the proceeds will be donated to charity.

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