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English description:
Double windmill illustrating air resistanceDanish 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
- Hauch references:
- Begynd.grund: §0
- Cabinet 1: 1031 5,02
- Literature:
- Nollet, J. A.: 1,03307
- Sigaud de Lafond : 1,0606
- Cataloque of Mechanical Instruments, Museo di Storia della Scienza, Firenze: 2,059
