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

Posted on November 25, 2015 by mikethemadbiologist

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

This entry was posted in NIST. Bookmark the permalink.

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

  1. jrkrideau says:
    November 26, 2015 at 3:17 pm

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

Comments are closed.