Laser used to measure length of string

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Laser used to measure length of string

Clip from How Long Is A Piece Of String?  |  SBS ONE  |  June 26, 2011

Alan Davies and Marcus du Sautoy visit a length bar interferometry unit and use a laser tracker to measure Alan's length of string.

Alan Davies and Marcus du Sautoy visit a length bar interferometry unit and use a laser tracker to measure Alan's length of string.

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