Samuel Langley

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Langley, Samuel


Born Aug. 22, 1834, in Roxbury, Mass.; died Feb. 27, 1906, in Aiken, S.C. American astrophysicist.

Langley was appointed director of the Allegheny Observatory in 1867. Beginning in 1887 he was at the Smithsonian Institution in Washington. Langley studied the distribution of energy in the solar spectrum and reestablished the solar constant. He invented the bolometer in 1880–81 and used it to measure the intensity of solar radiation. On the basis of these measurements, Langley compiled an atlas in 1901 of the infrared part of the solar spectrum.


Abbot, C. G. Samuel Pierpont Langley. Washington, D. C., 1934. (Smithsonian Miscellaneous Collections, vol. 92, no. 8, publication 3281.)
References in periodicals archive ?
Meanwhile, in the United States, the renowned railroad and bridge engineer Octave Chanute and the Smithsonian Institution's secretary, Samuel Pierpont Langley, had other approaches.
The highly paid Samuel Pierpont Langley, director of the Smithsonian Institute, and Otto Lilienthal of Germany, both respected experts on flight, were the sources of information for the Wrights.
The American astronomer Samuel Pierpont Langley (1834-1906) made the attempt on three separate occasions between 1897 and 1903 and almost succeeded but not quite.