One of the most important scientific discoveries of the Victorian age is still misunderstood even today, yet is commonly sold in novelty stores as an amusement.
The Crookes Radiometer is an airtight glass bulb containing a partial vacuum. It contained a set of tiny panels - reflective on one side, absorptive on another - which are mounted on a rotating spindle. The vanes spin when exposed to light, making the Radiometer the first solar energy device.
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