I’m a Nerd and the NIST Hall of Standards Is My Valhalla: The Ampere Measurer

This gizmo, observed at NIST, is a Raleigh current balance and was used in the classic 1912 determination of the absolute value of the ampere. It was also used in 1938 to redefine the international ampere as 0.99985 absolute amperes:

NIST 3

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1 Response to I’m a Nerd and the NIST Hall of Standards Is My Valhalla: The Ampere Measurer

  1. jrkrideau says:

    I bet if they had a Babbage Machine they would have to carry you out a closing time. 🙂

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