Bubble Level

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Name currently used to indicate any levelling instrument that makes use of a tube filled with water. Translation of the Latin libra aquaria.

Instrument of ancient origin for levelling canals and water conduits. Vitruvius mentions it in Book VIII of De architectura as libra aquaria.

Vitruvio (Vitruvius Pollio, Marcus), De Architectura, a cura di Pierre Gros, Einaudi, Torino, 1997, 2 voll., Lib. VIII, cap. V (vol. II, p. 1137).

Author of the entry: Filippo Camerota