Museo Galileo
Virtual Museum
Mobile diaphragm
    • Setting:
      Room XV
    • Maker:
    • Date:
      second half 18th cent.
    • Materials:
      brass, wood
    • Dimensions:
      265x234 mm
    • Inventory:
    • Mobile diaphragm (Inv. 2568)

The wooden frame carries a decorated brass plate with two holes. Facing the holes are two shutters, hinged on the plate. Each shutter has a diaphragm with three round holes of different diameters. Through a system of levers, the shutters are moved simultaneously, increasing or reducing the distance between the diaphragms and the corresponding holes. A rotating brass fork can hide one of the two holes.