CROOKE’S RADIOMETER ‘PSAW’ |
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| CROOKE’S RADIOMETER ‘PSAW’
(1042 A) |
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Comprising of partly evacuated glass bulb approx. 70mm dia. containing at its center a fine pivot which supports four light weight metal arms. One side of each vane is blackened, the reverse side is bright. Mounted on round base, when exposed to sunlight the vanes rotate.
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