Museo Galileo
Virtual Museum
Reduction compass
    • Setting:
      Room III
    • Maker:
    • Date:
      17th cent.
    • Materials:
    • Dimensions:
      length 175 mm
    • Inventory:
    • Reduction compass (Inv. 655)

Reduction compass with a moving center for reducing measurements by a factor ranging from 2 to 10. This is done by shifting the central hinge to one of the several points marked on the shorter section of the legs. The longer section is fitted with a micrometer screw for a precision adjustment of the compass opening. The instrument was used mainly to reproduce drawings. Very similar to item inv. 633. Provenance: Medici collections.