- For other persons named Theodore Lyman, see Theodore Lyman (disambiguation).
(1874 - 1954) was a U.S. physicist
, born at Boston
. He was graduated from Harvard
in 1897, where he also received his Ph.D.
in 1900. He became an assistant in physics
at Harvard, where he remained, becoming full professor
in 1917, and where he was also director of the Jefferson Physical Laboratory
(1908-17). Dr. Lyman made important studies in phenomena connected with diffraction gratings
, on the wave lengths
of extreme ultraviolet light
discovered by Schumann
and also on the properties of light of extremely short wave length
, on all of which he contributed valuable papers to the literature of physics
in the proceedings of scientific societies. During World War One
he served in France
with the American Expeditionary Force
, holding the rank of major of engineers.
He was the eponym of the Lyman series of spectral lines. The Lyman Crater, an impact crater that lies in the southern hemisphere on the far side of the Moon, was named after him.