Dimensions: 83x65x65 cm Materials: ash, metal Constructor: Dipartimento di scienza delle costruzioni, Università di Firenze Date: 1997
Working model after Bonaccorso Ghiberti, B.R. 228 (BNCF), fol. 107v
Another type of revolving crane, probably used on the scaffolding put up on the inner and outer masonry. The machine is fitted with a vertical pin-gear wheel that activates a jack for lifting light weights and a screw-operated platform for shifting the lifted load sideways.