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Baldassarre Lanci [attr.], Perpendicolo
Baldassarre Lanci [attr.], Level

c. 1560
Steel, gilt brass; length 76 cm, height 25,5 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 148

The weight on the lower part maintains the horizontal position of the steel bar, allowing survey operations of terrains and water ducts. The double graduated slits permitted the instrument to be used to measure inaccessible distances too.