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jstor.org
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Samuel Pierpont Langley, at earthobservatory.nasa.gov, "...sensitive to differences in temperature of one hundred-thousandth of a degree Celsius (0.00001 C). Composed of two thin strips of metal, a Wheatstone bridge, a battery, and a galvanometer...", accessed 31 October 2018
nasonline.org
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nationalaviation.org
"Enshrinee Samuel Langley". nationalaviation.org. National Aviation Hall of Fame. Retrieved February 13, 2023.
