Wavelengths of Mercury 198
DEC 01, 1950
DOI: 10.1063/1.3066707
The international standard of length, a platinum‐iridium bar located in a vault at the International Bureau of Weights and Measures near Paris, was measured relative to the wavelength of the red cadmium line by Michelson in 1892, and the value he derived for the wavelength of the red cadmium radiation has been provisionally adopted as the international standard of length.
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© 1950 American Institute of Physics
