Lonjé Molen, Bolsward

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Lonjé Molen, Bolsward
Tadema's molen Bolsward 19.JPG
Lonjé Molen, July 2007
Mill name Lonjé Molen
Tadema's Molen
Mill location Oude Rijksweg 6, 8701 MD, Bolsward
Coordinates 53°03′51″N 5°30′01″E / 53.06417°N 5.50028°E / 53.06417; 5.50028Coordinates: 53°03′51″N 5°30′01″E / 53.06417°N 5.50028°E / 53.06417; 5.50028
Operator(s) Wetterskip Fryslân
Year built 1824
Purpose Drainage mill
Type Smock mill
Storeys Three-storey smock
Base storeys Single-storey base
Smock sides Eight sides
No. of sails Four sails
Type of sails Dekkerised Common sails
Windshaft Cast iron
Winding Tailpole and winch
Auxiliary power Electric motor
Type of pump Archimedes' screw

Lonjé Molen or Tadema's Molen is a smock mill in Bolsward, Friesland, Netherlands which has been restored to working order. The mill is listed as a Rijksmonument, number 9861.[1]


Lonjé Molen was built in 1824. The mill was also named Tadema's Molen after one of the millmen.[2] In 1933, the mill was fitted with Dekkerised sails.[3] In 1948/49 it was proposed that an electric motor would be installed to drive the mill. This proposal was dropped in 1950.[2] The sails were renewed in 1959.[3] In 1967 an electric motor was installed, but arranged so the mill could still work too. The mill was restored in 1970/71.[2] Further restoration work was done by millwrights Bouwbedrijf Hiemstra of Tzummarum in the early 2000s, at a cost of €100,000. The official reopening by Mayor Koopmans of Bolward took place on 18 September 2002.[3]


For an explanation of the various items of machinery, see Mill machinery.

Lonjé's Molen is what the Dutch describe as an "achtkante grondzeiler" . It is a smock mill winded by a winch. There is no stage, the sails reaching almost to the ground. The mill has a single-storey brick base and a three-storey smock. The smock and cap are thatched. The four Common sails have leading edges steamlined with the Dekker system. They have a span of 18.72 metres (61 ft 5 in) and are carried in a cast-iron windshaft. This was cast by the Koninklijke Nederlandse Grof Smederij, Leiden, Noord Holland in 1897. The windshaft also carries the brake wheel which has 47 cogs. This drives the wallower (28 cogs) at the top of the upright shaft. At the bottom of the upright shaft, the crown wheel (35 cogs) drives the wooden Archimedes' screw via a gear wheel with 31 cogs. The Archimedes' screw has an axle diameter of 532 millimetres (1 ft 9 in) and is 1.43 metres (4 ft 8 in) diameter overall. It is inclined at an angle of 22°. Each revolution of the screw lifts 907 litres (200 imp gal) of water.[2]

Public access[edit]

Lonjé Molen is open to the public by appointment.[4]


  1. ^ "Technische gegevens" (in Dutch). De Hollandsche Molen. Retrieved 27 August 2009.  (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. 214. ISBN 90-330-1522-6. 
  3. ^ a b c "Geschiedenis" (in Dutch). De Hollandsche Molen. Retrieved 27 August 2009.  (Click on "Geschiedenis" to view.)
  4. ^ "Informatie" (in Dutch). De Hollandsche Molen. Retrieved 27 August 2009.  (Click on Informatie" to view.)