Museo Galileo
Virtual Museum
Kit of magneto-electric machine, Clarke pattern
    • Setting:
      Room XVI
    • Inventor:
      Edward Marmaduke Clarke
    • Maker:
    • Date:
      ca. 1840
    • Materials:
      mahogany, brass, iron, steel, glass
    • Dimensions:
      box 270x180x365 mm, base 360x180 mm
    • Inventory:
    • Kit of magneto-electric machine, Clarke pattern (Inv. 515)
    • Kit of magneto-electric machine, Clarke pattern (Inv. 515)

Well-made kit including a Clarke-pattern generator, an additional coil with commutator, a glass voltameter, and other accessories, not all complete. The maker Edward Marmaduke Clarke improved Pixii's machine with this arrangement, which includes a pair of coils rotating near the poles of an upright permanent magnet. His generator had two pairs of coils (as does this kit), one of fine wire for high voltage, the other of coarse wire for large currents. His commutator provided unidirectional current. This magneto-electric machine, widely used in laboratories, was the first to be employed in electrotherapy. A small glass with electrodes connected to the generator poles demonstrated that the current from the generator could decompose water. Provenance: Lorraine collections.