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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. The computer was built and used at the Atomic Energy Research Establishment in Harwell, Oxfordshire. Construction started in 1949, and the machine became operational in April 1951. It was handed over to the computing group in May 1952 and remained in use until 1957. It used "dekatrons" (gas-filled decade counting tubes) for volatile memory, similar to RAM in a modern computer, and paper tape for input and program storage. Output was to either a teleprinter or to a paper tape punch. The machine initially had twenty 8-digit dekatron registers for internal storage, which was increased to 40 which appeared to be enough for nearly all calculations. It was assembled from components more commonly found in a British telephone exchange. Although it could on occasions act as a true stored-program computer, that was not its normal mode of operation. It had a multiplication time of between 5 and 10 seconds. From 2009 to 2012, it was restored at the National Museum of Computing, where it is described as "the oldest original functioning electronic stored program computer in the world". Wiki

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