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Radiometer

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Definitions of Radiometer

Pronunciation : Ra`di*om"e*ter
Part of Speech : n.
Etymology : [L. radius radius + -meter: cf. F. radiom?tre.]
Definition : 1. (Naut.)

Defn: A forestaff.

2. (Physics)

Defn: An instrument designed for measuring the mechanical effect of radiant energy.

Note: It consists of a number of light discs, blackened on one side, placed at the ends of extended arms, supported on an a pivot in an exhausted glass vessel. When exposed to rays of light or heat, the arms rotate.
Source : Webster's Unabridged Dictionary, 1913

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