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NBS to base legal volt on the Josephson effect

OCT 01, 1972
Physics Today

The National Bureau of Standards has adopted a new procedure for maintaining the US legal volt based on the determination of the ratio of 2e/h using the ac Josephson effect. Recent work at the University of Pennsylvania and NBS has shown that 2e/h can be determined in terms of a particular unit of voltage to 1 part in 10 million or better.

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This Content Appeared In
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Volume 25, Number 10

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