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Crookes Radiometer

For the Smile on Saturday challenge: "The Shadow of Glass."

 

The Crookes radiometer, also known as a light mill, is a device that consists of a glass bulb with a partial vacuum and a set of vanes that rotate when exposed to light. It was invented in 1873 by Sir William Crookes and is used to demonstrate the effects of light and heat energy.

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Uploaded on May 2, 2025
Taken on May 2, 2025