The Center for Grassroots Oversight

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Profile: Samuel P. Langley

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

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)


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