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Alan Turing’s secret notebook is set to go to auction and sell for seven figures

Alan Turing’s secret notebook is set to go to auction and sell for seven figures

A notebook kept secret by Alan Turing during World War 2 is set to go to auction and sell for at least seven figures.

The manuscript, made up of 56 pages, has never been seen in public and is almost certainly the only extensive writing by Turing in existence.

When Turing committed suicide in 1954 following chemical castration as punishment for his homosexuality, the notebook was among papers left to his close friend and mathematician Robin Gandy.

He discovered the foundations of computer science and notes that signified how he would break the German Enigma Code. In the blank center pages, Gandy wrote his dream journal. It was hidden among Gandy’s personal effects until his death.

Benedict Cumberbatch, the Oscar-nominated actor who portrayed Turing in the 2014 biopic The Imitation Game, said: ‘Alan Turing was a war hero, who broke the Enigma code helping to bring an end to World War II, the father of modern computing science, and a gay icon who lived in a time of intolerance and tragically committed suicide as a result.

‘His impact on our everyday lives is enormous, and the thought of being able to hold a manuscript that was written by him is thrilling.’

The manuscript will be sold Bonhams in New York on 13 April. A portion of the sale will go to charity.

Alan Turing Notebook