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United Scientific Supplies Radiometer

How do the vanes turn under no apparent power?

Supplier:  United Scientific Supplies RADIO1

Catalog No. S41818A

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  • 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).



Glass Bulb
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