An old bicycle light generator usually refers to a bicycle dynamo—a small device that generates electricity from the motion of the bike to power lights. 
What it is
The classic type is the bottle dynamo. It’s mounted on the frame so a small roller presses against the bicycle tire.
How it works
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When you pedal, the wheel rotates.
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The roller on the dynamo spins against the tire.
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Inside the dynamo, a magnet rotates in a coil (based on the principle of electromagnetic induction).
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This produces electric current that powers the bike’s lights.
Common types of old generators
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Bottle Dynamo – mounted on the frame and touches the tire.
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