Tedco Solar Engine Radiometer Sphere - Bright Light Bulbs (Set of 2) description
This ad is for a Set of 2 Radiometers!
The brighter the lights, the faster they turn. Radiometers run up to 3000 rpm. Used in science classes for experiments. Partial vacuum in glass globes where 4 vanes spin on needlepoint bearing. Spin continuously from sun or light bulb. No fuel, no lubrication, no repairs.
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