Ancient Roman steelyard, from Pompeii, Italy, 79 AD.
3 5 c m
40cm
actual image size: 32cm x 27cm

Ancient Roman steelyard, from Pompeii, Italy, 79 AD.

© Science Museum / Science & Society Picture Library

Description

Like other balances, this device measures mas rather than weight. Since the force of gravity is the same at both ends of the beam, which acts as a lever, the measurement that it gives would be the same on Earth or on the Moon. It does not depend on gravity. The head-shaped weight is moved along the beam until it balances with the object whose mas is being measured. The mas is shown by a scale along the beam.
 

Image Ref.

10314092
 

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