Actinometer -- from Eric Weisstein's World of Physics

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Experimental Physics "> Instruments "> Detectors v

Thermodynamics "> Radiative Transfer v

Actinometer

An instrument used to measure the heating power of sunlight. William Herschel Eric Weisstein's World of Biography used such a device to discover infrared radiation, which could be detected via its heating effect but not seen.

Bolometer