The world’s oldest working computer was rebooted 3 years ago

It was three years ago on 20 November that the British National Museum of Computing (TNMOS) rebooted the world’s oldest working computer, the Harwell Dekatron, also known as WITCH (Wolverhampton Instrument for Teaching Computing from Harwell). With this, the machine made an entry into the Guiness Book of World Records in 2013.
The design of the computer began in Harwell in Oxfordshire, and the machine was put to work at the Atomic Energy Research Establishment in Harwell in 1951.

The restored computer was assembled and rebooted by volunteers in 2012. The original machine was used for mathematical modelling, multiplication of two numbers could take as long as ten seconds. However, no-one complained about its performance. By 1957, it became obsolete and was donated to the Wolwerhampton Institute of Technology. Researchers there had realised the educational potential of the machine, and they renamed it accordingly. It was retired in 1973, then transferred to the Birmingham Museum of Science and Industry. The museum was closed in 1997, and the machine was re-discovered in 2008.