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English description:

Double windmill illustrating air resistance

Danish Instrument Inventory text:

Windmill. Double. Mahogany. Base 350x135x55. 3 pillars support 2 8-vaned mills Dia290, one with the vanes oriented to strike the air broadsides, the other edgewise. A brass spring and latch start both mills. In vacuum both mills will revolve for the same length of time, not so in air.Signed with ink at he bottom: 1828 Jav. This can not refer to the date, as the instrument is mentioned in Hauch's inventory of 1827.c1800 (g)

  • Category: Mechanics
  • Hauch number: A47
  • Inventory number: 3700
  • Danish Instrument Inventory number: 1619
  • Literature:
  • Nollet, J. A.: 1,03307
  • Sigaud de Lafond : 1,0606
  • Cataloque of Mechanical Instruments, Museo di Storia della Scienza, Firenze: 2,059
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