Radiometer

Ra`di*om"e*ter

(r`d*m"*tr), n. [L. radius radius + -meter: cf. F. radiomtre.] 1. (Naut.) A forestaff.
[1913 Webster]

2. (Physics) An instrument designed for measuring the mechanical effect of radiant energy.
[1913 Webster]

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.
[1913 Webster]

 

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Mon 10th December 2018