Definitions
from The Century Dictionary.
- noun A spectrum of a thermal radiation, considered not with reference to its effect upon the eye, but with reference to its intrinsic energy or heating power.
Etymologies
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Examples
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For in February, 1885, Professor Langley succeeded, after many fruitless attempts, in getting measures of a "lunar heat-spectrum."
A Popular History of Astronomy During the Nineteenth Century Fourth Edition 1874
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1886 Solar heat-spectrum extended by Langley to below five microns.
A Popular History of Astronomy During the Nineteenth Century Fourth Edition 1874
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1885, February Langley measures the lunar heat-spectrum.
A Popular History of Astronomy During the Nineteenth Century Fourth Edition 1874
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