Radiometer
radiometer (-ometer),n. (L. radius radius + -meter: cf. F.
radiometre.) 1. (Naut.) A
forestaff.
2. (Physics) An instrument designed for
measuring the mechanical effect of radiant energy.
f It consists of a number of light disks, blackened on one
side, placed at the ends of extended arms, supported on a pivot in an
exhausted glass vessel. When exposed to rays of light or heat, the
arms rotate.
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