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United Scientific Supplies Radiometer 
How do the vanes turn under no apparent power?
Supplier: United Scientific Supplies RADIO1
Description
- Made from a glass bulb from which much of the air has been removed
- Inside is a rotor with four vanes on low-friction spindle
- Each vane has blackened side and silvered side
- Heating by sunlight or artificial light makes vane rotate
- Differential heating of the two sides results and creates the motion
Order Info
Dimensions: 6 x 4 x 4 in. (15.2 x 10.2 x 10.2cm); shipping weight: 0.3 lb. (136g).
Specifications
| Radiometer | |
| Glass Bulb |