Mercury Delay Line Unit from LEO

Lyons Electronic Office (LEO)1949/1951

The National Museum of Computing

The National Museum of Computing
MILTON KEYNES, United Kingdom

Mercury delay lines are a form of memory which work using an ultrasonic acoustic signal sent back and forth through liquid mercury held in a long tube, known as a delay line. LEO, the world's first business/office computer, is an example of a computer which used mercury delay line memory. Built between 1949–1951, LEO's technology marked a transformation in office processes and kick-started the British computer industry.


  • Title: Mercury Delay Line Unit from LEO
  • Creator: Lyons Electronic Office (LEO)
  • Date Created: 1949/1951
  • Location: The Science Museum (London, UK).
  • Rights: Author: Marcin Wichary (San Francisco, USA)(2006). Attribution 2.0 Generic (CC BY 2.0) (https://creativecommons.org/licenses/by/2.0/deed.en)

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