Samuel Langley

Samuel Langley
Langley, circa 1895
3rd Secretary of the Smithsonian Institution
In office 1887–1906
Preceded by	Spencer Fullerton Baird
Succeeded by	Charles Doolittle Walcott
Personal details
Born	(1834-08-22)August 22, 1834 Roxbury, Massachusetts, U.S.
Died	February 27, 1906(1906-02-27) (aged 71) Aiken, South Carolina, U.S.
Known for	Solar physics
Awards	Rumford Medal (1886) Henry Draper Medal (1886) Janssen Medal (1893)[1][2]
Signature

Samuel Pierpont Langley (August 22, 1834 – February 27, 1906) was an American aviation pioneer, astronomer and physicist who invented the bolometer. He was the third secretary of the Smithsonian Institution and a professor of astronomy at the University of Pittsburgh, where he was the director of the Allegheny Observatory.