Name for a glass bulb containing objects white on one side, black on the other, which spin on a pivot in light

When this vacuum glass bulb has light shining on it, the objects inside spin on a pivot point. The stronger the light, the faster they spin. The bulb does not produce the light itself. It isn’t connected to any power source. The spinning of the objects inside is caused by light from any other outside source shining on the glass bulb. But what is this collectable novelty item called?

1 Comment

  1. Cat
    on November 30th, -0001

    Radiometer.

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Name for a glass bulb containing objects white on one side, black on the other, which spin on a pivot in light

When this vaccum glass bulb has light shining on it, the objects inside spin on a pivot point. The stronger the light, the faster they spin. But what is this novelty item called?

3 Comments

  1. MexicanMug
    on November 30th, -0001

    Disco Ball

  2. Guineapig
    on November 30th, -0001

    Thanks for the easy points…… that’s an easy one it’s called a light bulb.

  3. BlindPoet
    on November 30th, -0001

    thanks.

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