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Harnessing the power of light
The Crookes radiometer, also known as the light mill or solar engine, consists of an airtight glass bulb, containing a partial vacuum. It was invented in 1873 by the chemist Sir William Crookes. Inside are a set of vanes which are mounted on a spindle. The vanes can rotate up to 3,000 RPM when exposed to light. The reason for the rotation has been the cause of much scientific debate. The Radiometer is 3 inches in Diameter by 5 inches tall.
It was invented in 1873 by the chemist Sir William Crookes as the by-product of some chemical research. In the course of very accurate quantitative chemical work, he was weighing samples in a partially evacuated chamber to reduce the effect of air currents, and noticed the weighings were disturbed when sunlight shone on the balance. Investigating this effect, he created the device named after him. It is still manufactured and sold to this day as a curiosity item.
 
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