The swingometer
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Election 2015: The swingometer in 60 seconds

A mainstay of BBC election night coverage, the swingometer was designed to explain the unfolding results.

From a handmade prop to state-of-the-art graphics, the swingometer has helped predict general election results.

Explore the rich history of the swingometer with the BBC News Timeliner

  • 28 Apr 2015
Go to next video: BBC Rewind: The swingometer makes its debut