De Gans, Ezumazijl

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De Gans, Ezumazijl
Ezumasyl De Guos.JPG
De Gans, March 2007
Mill name De Gans
Mill location Tibsterwei, 9133 DM, Ezumazijl
Coordinates 53°20′58″N 6°18′29″E / 53.34944°N 6.30806°E / 53.34944; 6.30806Coordinates: 53°20′58″N 6°18′29″E / 53.34944°N 6.30806°E / 53.34944; 6.30806
Operator(s) Stichting Monumentenbehoud Dongeradeel
Year built 1850
Purpose Drainage mill
Type Smock mill
Storeys Two-storey smock
Base storeys Single-storey base
Smock sides Eight sides
No. of sails Four sails
Type of sails Common sails
Windshaft Cast iron
Winding Tailpole and winch
Type of pump Archimedes' screw

De Gans (English: The Goose) is a smock mill in Ezumazijl, Friesland, Netherlands which has been restored to working order. The mill is listed as a Rijksmonument, number 31571.[1]


De Gans was built in 1850 by farmer Martinus Aukes Wierda who owned the Guozzepôle farm.[2] The mill drained the Ganzenpolder.[3] It drained 28 hectares (69 acres) of land,[4] depositing the drainage water into the Zuider Ee.[2]

By 1962, it was uneconomic to work the mill and it was replaced by an electric motor.[5] It had been sold to the local authority by 1965. In 1970, the mill was restored by millwright De Roos of Leeuwarden. During this restoration the Patent sails were replaced with Common sails. The mill retained its wooden windshaft after this restoration. In 1988, the mill was again restored, this time by Thijs Jellema of Birdaard. A new cast-iron windshaft was fitted. The old wooden windshaft is preserved in De Zwaluw, Birdaard.[2] De Gans is the sole survivor of six windmills which formerly drained the Ganzenpolder.[5]


De Gans is what the Dutch describe as an achtkante grondzeiler - a smock mill whose sails reach almost to the ground. It is a two-storey smock mill on a single-storey base. The mill is winded by tailpole and winch. The smock is covered in vertical wooden boards. The sails are Common sails. They have a span of 10.60 metres (34 ft 9 in). The sails are carried on a cast-iron windshaft. The windshaft also carries the brake wheel which has 32 cogs. This drives the wallower (18 cogs) at the top of the upright shaft. At the bottom of the upright shaft, the crown wheel, which has 28 cogs drives a gearwheel with 26 cogs on the axle of the Archimedes' screw. The axle of the screw is 210 millimetres (2¼ inches) diameter and the screw is 710 millimetres (2 ft 4 in) diameter and 4.00 metres (13 ft 1 in) long. The screw is inclined at 24°. Each revolution of the screw lifts 83.8 litres (18.4 imp gal) of water.[2]


  1. ^ "Technische gegevens" (in Dutch). De Hollandsche Molen. Retrieved 5 February 2010.  (Click on "Technische gegevens" to view.)
  2. ^ a b c d Stichting De Fryske Mole (1995). Friese Molens (in Dutch). Leeuwarden: Friese Pers Boekerij bv. p. 134. ISBN 90-330-1522-6. 
  3. ^ "Geschiedenis" (in Dutch). De Hollandsche Molen. Retrieved 5 February 2010.  (Click on "Geschiedenis" to view.)
  4. ^ "Ezumazijl, Friesland" (in Dutch). Molendatabase. Retrieved 5 February 2010. 
  5. ^ a b "Ezumazijl - De Gans". Stichting Monumentenbehoud Dongeradeel. Retrieved 5 February 2010.