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John Herivel
British science historian, World War II codebreaker at Bletchley Park (1918-2011) · United Kingdom · On the map · Academics · Died at 92
John William Jamieson Herivel was a British science historian and World War II codebreaker at Bletchley Park.
John Herivel is read about 11 times a day, in 7 languages.
A typical day, 30 days to 20 June 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 60 days, one point a day.
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Photos 4
Military Enigma machine.
Two Enigma rotors showing electrical contacts, stepping ratchet (on the left) and notch (on the right-hand rotor opposite letter D).
Three rotors inside an Enigma machine. In the middle rotor, the ring setting pin can be seen with a small red indicating arrow adjacent to the 01 position. To adjust the ring setting, the spring-loaded pin could be moved to the right to allow the ring to be turned until at the desired position.![75 Lonsdale Road, Oxford, where Herivel died. A blue plaque commemorates him as 'mathematician and codebreaker'.[33][34]](https://upload.wikimedia.org/wikipedia/commons/thumb/3/30/John_Herivel%27s_house_in_Oxford.jpg/1280px-John_Herivel%27s_house_in_Oxford.jpg)
75 Lonsdale Road, Oxford, where Herivel died. A blue plaque commemorates him as 'mathematician and codebreaker'.[33][34]About this person
Country
United Kingdom
Category
Academics
Type
Academic
Status
Deceased
Dates
Lived 1918 to 2011 · aged 92
