Cyclometer

The cyclometer was a cryptologic device designed, "probably in 1934 or 1935," by Marian Rejewski of the Polish Cipher Bureau's German section (BS-4) to facilitate decryption of German Enigma ciphertext. The original machines are believed to have been destroyed shortly before the German invasion of Poland that launched the Second World War, to prevent the Germans learning that their cipher had been broken.

This article is about the cryptologic device. For the device used in cycling, see cyclocomputer. "Cyclometer" also means a person who works either on the classic circle-squaring problem or on the geometry of circles.

Together with Rejewski's later cryptologic bomb, it can be viewed as a predecessor to the Bombe that was later to break the Enigma code later in the war at Bletchley Park in England.

Using drawings made by Rejewski, Hal Evans and Tim Flack at the Department of Engineering, University of Cambridge, in 2019 constructed a working version of the cyclometer.

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