See Radiant Energy with a Radiometer

If you really want to see how powerful the sun can be and how natural the experience of it is - get a Radiometer. I had one of these as a kid and was always mesmerized by it. 5" high evacuated clear glass stand 3" in diameter at the top. A four bladed vane is balanced on a needle inside the sphere. Because opposite surfaces of the vanes are black and white, incident radiant energy is absorbed or reflected to a different degree. The result is a spinning vane. The brighter the light, the faster it spins. Simple, but compelling.

At RADIOMETER

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