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, 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