The Harwell computer, later known as the Wolverhampton Instrument for Teaching Computing from Harwell (WITCH), or the Harwell Dekatron Computer, was an early British relay-based computer. It is currently being restored at The National Museum of Computing at Bletchley Park, where it is described as "the oldest original functioning electronic stored program computer in the world".
- An Electronic Digital Computer - Electronic Engineering - August 1951 - By R. C. M. Barnes, B.Sc., E. H. Cooke-Yarborough, M.A., A.M.I.E.E., and D. G. A. Thomas, M.A.
- Partial List of Parts Used with datasheets
- Harwell Computer Wikipedia Entry
- Computer Conservation Society Harwell Computer Page
- BCS Harwell Computer Conservation Project Page
- The Nation Museum of Computing Large Systems Page
- The Nation Museum of Computing Harwell Computer Restoration Updates Page
- Photos of Harwell Computer from Cecil Ramsbottom's Grandson