Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Libra

（σταθμός).

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1.

A balance or pair of scales,

Libra. (Millin, Peint. de Vases Ant. ）

whose principal parts were (a) the beam, iugum, ζυγόν; (b) the scales, lances, τάλαντα. When the beam had a tongue working in an “eye” (agina), the tongue was called examen and ligula. This sort of balance was called trutĭna (τρυτάνη). A steelyard was called statēra.

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2.

A constellation (Ζυγός) placed in the Zodiac at the equinox when days and nights are equally balanced.

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3.

An instrument for ascertaining the level of the water in an aqueduct (Vitruv. viii. 5, 1).