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Eisco Crookes Radiometer

Eisco-Crookes-Radiometer-Eisco-PH0418A-P-This-radiometer-consists-of-a-partly-evacuated-glass-bulb-approximately-70mm-in-diameter-containing-a-fine-pivot-which-supports-four-light-weight-metal-arms-One-side-of-each-vane-is-blackened-the-reverse-side-is-bright-P-P-On-exposure-to-sunlight-or-a-sufficiently-bright-incandescent-light-source-the-vanes-turn-The-absorption-of-radiant-energy-by-the-blackened-side-of-the-vanes-sets-up-a-temperature-differential-with-respect-to-the-bright-sid

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