Angstrom in his celebrated researches upon wave-lengths.
ANDERS JONAS ANGSTROM (1814-1874), Swedish physicist, was born on the 13th of August 1814 at LOgdO, Medelpad, Sweden.
His son, Knut Johan Angstrom, was born at Upsala on the 12th of January 1857, and studied at the university of that town from 1877 to 1884.
The most convenient unit is that adopted by the International Union of Solar Research and is called an Angstrom (A); and is equal to i 08 cms. A.
Perot's number is now definitely adopted to define the Angstrom, and need never be altered, for should at some future time further researches reveal a minute error, it will be only necessary to change slightly the temperature or pressure of the air in which the wave-length is measured.
Angstrom endeavoured to find the variation of conductivity by this method, but he assumed c to be the same for two different bars, and made no allowance for its variation with temperature.