The above explanations aren't correct.1. Black side absorbs more sunlight than the bright side, so it gets hotter. 2. The air inside is pumped down to a low pressure (*not* a vacuum) so they travel a significant distance before hitting another molecule. 3. When they hit the black side, they bounce back faster than from the bright side because the molecules of the black side, being hotter, are vibrating faster then those on the other side. 4. There is therefore a greater reaction force acting on the black side of each vane, causing the vanes to rotate.

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TEDCO Solar Radiometer

Q: How does this little perpetual globe thing work?

Jake Wheeler's comment is actually wrong. The movement is not due to light pressure, as it actually spins towards the sides with white paint on them. Rather, light hitting the black side of the vane heats the air around it, which expands and pushes the vane forwards. it is evacuated to a partial vacuum so that there is very little air resistance but still enough air to give the pushing effect.

Q: Can the bulb be removed from the base?

Not recommended. The base is securely glued to the bulb. However if you were to soak it in a solvent like methyl ethyl ketone or acetate like nale polish remover or gasoline just do it outside one of those solvents will probably work to remove the base. If you crack or break the glass you will ruin the Radiometer as it has a vacuum! So do not use any force in its removal !

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TEDCO Solar Radiometer

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What is it

How does this little perpetual globe thing work?

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