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Antonio Bianchini, Compasso astronomico e topografico
Antonio Bianchini, Astronomical and surveying compasses (Folding rule)

1564
Gilt brass; length 37,5 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 2511

Unusual compasses made for Cosimo de’ Medici. It was used to measure terrestrial and celestial distances.