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Leo III Tape Reels

English Electric Leo Tape Reel and Reel Cases dated 1966.
As far as we know, from 1962 (the introduction of Leo III machines) there were only 94 installations of the Leo III. We do not know where our reels originated.
Apart from the pictures of our reel and cases, the remaining show tape reels in Leo III installations.
Key documents on the development of LEO I, the world’s first business computer, have been made available online at The material is part of the archive of John Simmons, statistician and initiator of the LEO project, and includes development reports, memoranda, photographs and a ‘Layman’s guide to LEO’ (a users’ manual), all dating from 1947-1955.
We thank the Modern Records Centre, University Library, University of Warwick for this invaluable resource at Coventry, CV4 7AL, UK.

Date : 1966

Manufacturer : English Electric Leo

Physical Description : 3 Tape Reels, 1 Has inner steel ring

This exhibit has a reference ID of CH1816. Please quote this reference ID in any communication with the Centre for Computing History.

Scan of Document: Leo III Tape Reels

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