Crookes Radiometer
Radiomètre de Crookes
Crookesches Radiometer, Lichtmühle

The Crookes radiometer (also known as a light mill) consists of an airtight glass bulb containing a partial vacuum, with a set of vanes which are mounted on a spindle inside. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.

 Video on YouTube: How a Crookes radiometer works

 

Hauteur • Height • Höhe : 18 cm • 7" 1/16
Diamètre • Diameter • Durchmesser : 6 cm • 2" 3/8

 

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