
The swingometer is a graphics device that shows the swing from one party to another on British election results programmes. It was invented by Peter Milne, and later refined by David Butler and Robert McKenzie. The first outing on British television was during a regional output from the BBC studios in Bristol during the 1955 general election (the ...
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http://en.wikipedia.org/wiki/Swingometer

instrument for measuring swing in votes during an election
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