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Profile: Samuel P. Langley

Samuel P. Langley was a participant or observer in the following events:

1880: Bolometer Invented

Samuel P. Langley invents the bolometer. His device measures light from starlight and from the sun’s rays. It is constructed of a fine wire connected to an electric circuit. When starlight or sunlight falls on the wire, the wire becomes slightly warmer, increasing the electrical resistance of the wire. [US Department of Energy, 2002 pdf file]

Entity Tags: Samuel P. Langley

Timeline Tags: US Solar Industry

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