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Circular spring balance, 18th century.

Circular spring balance, 18th century.
4 0 c m
actual image size: 25cm x 32cm


This type of balance measures weight rather than mas. The oval spring stretches when a weight is hung from the balance, turning a needle and giving a reading on the dial. This reading varies with gravity. On the Moon, for example, the spring balance would indicate a weight one sixth of that which it would indicate on Earth.

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© Science Museum / Science & Society Picture Library

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