Solar Radiometer
Solar Radiometer

Solar Radiometer

Regular price $49.95
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This science fiction gadget spins its pinwheels in sunlight. No batteries needed!

A Solar Radiometer, also known as a 'Crookes' radiometer', has four vanes suspended inside a glass bulb. Inside the bulb, there is a vacuum. When you shine a light on the vanes in the radiometer, they spin, and in bright sunlight, they can spin at several thousand rotations per minute!