Category:Radiometer

Ra`di*om"e*ter, n. Etym: [l. radius radius + -meter: cf. F. Radiomètre.]

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.