Definitions
from The Century Dictionary.
- noun An instrument for determining the intensity of solar radiation: usually a black-bulb thermometer inclosed in a glass-covered case internally blackened.
Etymologies
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Examples
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Horace Bénédict de Saussure (1740-1799), a Swiss physicist, geologist, and early Alpine explorer, invented the heliothermometer (1767), an instrument for measuring solar radiation.
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