Museo Galileo
Virtual Museum
Mounted prism
    • Setting:
      Room XI
    • Maker:
    • Date:
      second half 18th cent.
    • Materials:
      glass, wood, brass
    • Dimensions:
      332x124x210 mm, prism side 30 mm
    • Inventory:
    • Mounted prism (Inv. 743)

The wooden base holds two supports between which an equilateral glass prism is hinged by means of a brass ring nut. The prism can be fixed in the desired position with a pair of threaded knobs. Isaac Newton used instruments of this type for his famous experiments on the separation of white light into a polychromatic spectrum.