logo Museo Galileo - Institute and Museum of the History of Science
Squadro agrimensorio
Surveyor’s square

1654
Brass; 15x6 cm
Florence, Istituto e Museo di Storia della Scienza, inv. 680

The upper part was used for surveying, while the cylinder with the 8 slits was used to establish orthogonal alignments and 30° and 45° angles.