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NPL's main entrance on Hampton Road
NPL's main entrance on Hampton Road
The Electricity Division of the National Physical Laboratory in 1944
The Electricity Division of the National Physical Laboratory in 1944
Robert Watson-Watt
Robert Watson-Watt
Louis Essen at right, with Jack Perry
Louis Essen at right, with Jack Perry
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A Kibble balance, which is used to measure weight via electric current and voltage. With this instrument, the measurement of mass is no longer depende
A Kibble balance, which is used to measure weight via electric current and voltage. With this instrument, the measurement of mass is no longer dependent on a defined mass standard and is instead dependent on natural physical constants.
Computer-generated image realising the international prototype of the kilogram (IPK), made from an alloy of 90-per cent platinum and 10-per cent iridi
Computer-generated image realising the international prototype of the kilogram (IPK), made from an alloy of 90-per cent platinum and 10-per cent iridium by weight