The first endeavor led to the construction of the radiometer.
Count Bathyani recently took up a radiometer to a height of about a mile.
The latest use to which the radiometer has been put was to test the viscosity of gases at decreasing pressures.
To a radiometer (fig. 6) with attached charcoal bulb B was sealed a tube ending in a small bulb A containing a globule of mercury.
The monitors were synchronized with the radiometer and changed view at every ten-mile marker.
Thus it appears that we have been able to show by very definite experimental evidence that the radiometer is a heat engine.
The spectroscope and the radiometer are more wonderful than any ‘supernatural’ thing yet heard of.
Instead of using the fan in this experiment, we may use the "electric" radiometer with similar effect.
radiometer ra·di·om·e·ter (rā'dē-ŏm'ĭ-tər)
A device that measures the intensity of radiant energy, consisting of a partially evacuated glass bulb containing lightweight vertical vanes, each blackened on one side, suspended radially about a central vertical axis to permit their revolution about the axis as a result of incident radiation.
An instrument that detects electromagnetic radiation.
A device for determining the penetrative power of x-rays.
A device used to detect or measure radiation. Radiometers generally consist of a glass bulb containing a rarefied gas in which four diamond-shaped paddles are mounted on a central axis. Each paddle is black on one side and silvery on the other. When radiation such as sunlight strikes them, the black side absorbs radiation and the silvery side reflects it, resulting in a temperature difference between the two sides and causing motion of gas molecules around the edges of the paddles. This motion of the surrounding gas molecules causes the paddles to spin. Precision radiometers, which use a complete vacuum rather than a gas, exploit the difference in radiation pressure on either side of the paddles to cause them to spin. Radiometers measure the intensity of radiation by measuring the rate of spin of the paddles. Also called light mill.