Museo Galileo
Virtual Museum
Modified Carré electrical machine
    • Setting:
      Room XVI
    • Inventor:
      Ferdinand-Philippe Carré
    • Maker:
    • Place:
    • Date:
      ca. 1890
    • Materials:
      mahogany, brass, iron, ebonite, glass
    • Dimensions:
      total height with table 715 mm, base 1070x448 mm, glass disk diameter 360 mm, thickness 7 mm, ebonite disk diameters 500 and 360 mm, thicknesses 7 and 9.4 mm
    • Inventory:
      Dep. LV, Torino
    • Modified Carré electrical machine (Dep. LV, Torino)
    • Modified Carré electrical machine (Dep. LV, Torino)

This is a kind of double Carré machine combining friction and induction. There is a large ebonite disk at the center that receives the charges from a pair of disks placed on the sides. One is a glass disk, rubbed by a silk cushion, the other an ebonite disk, rubbed by a fur cushion. The charges are induced by two brass collectors set at the edges of the disks, where they overlap with the central disk. The charges are then collected by two brass spheres—one for the positive charge, the other for the negative charge—connected by a glass tube secured to a brass support. This type of generator is exceptionally rare.