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RADIOMETER
Another oldie but goodie. 5" high evacuated clear glass bulb mounted in a black 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. Brief explanatory instruction sheet included.
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3817P2 2 PACK SAVINGS! | |
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3817P1 RADIOMETER |
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