What are they called?

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brass monkey 15 years ago

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A 4 bladed rotor inside (an evacuated?) glass bulb, one side of each blade is black, t'other side white/silver, I forget. Show it some sun and it rotates. I'm damned if I can put a name to them.

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Ericp 15 years ago

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Crookes Radiomiter?

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Ericp 15 years ago

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formatting link

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brass monkey 15 years ago

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