Britain's hefty Harwell Dekatron is back in the Guinness Book of World Records after being recognised - for the second time - as the world's oldest working digital computer.

Elderly giant takes 10 seconds to divide a number

Harwell Dekatron Specs in full:

• Power Consumption: 1.5kW
  
• Size: 2m high x 6m wide x 1m deep
  
• Weight: 2.5 tonnes
  
• Number of Dekatron counter tubes: 828
  
• Number of other valves: 131
  
• Number of relays: 480
  
• Number of contacts or relay switches: 7073
  
• Number of high speed relays: 26
  
• Number of lamps: 199
  
• Number of switches: 18

The WITCH is available to visit at The National Museum of Computing in Bletchley Park.

A video of the restoration process is on YouTube here:

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