What is "pyroscope"

Pyroscope \Pyr"o*scope\, n. [Pyro- + -scope: cf. F. pyroscope.] (Physics) An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf. [R.]

n. (context dated physics English) an early form of pyrometer

n. a pyrometer that uses the color of the light emitted by a hot object [syn: optical pyrometer]