De Oegekloostermolen is a hollow post mill in Hartwerd

Hartwerd

Hartwerd is a small village in Wûnseradiel in the province Friesland of the Netherlands and has around 150 citizens . A restored windmill. De Oegekloostermolen, stands near the village....

, Friesland

Friesland

Friesland is a province in the north of the Netherlands and part of the ancient region of Frisia.Until the end of 1996, the province bore Friesland as its official name. In 1997 this Dutch name lost its official status to the Frisian Fryslân...

, Netherlands

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 which was built before 1830. The mill has been restored to working order. It is listed as a Rijksmonument

Rijksmonument

A rijksmonument is a National Heritage Site of the Netherlands, listed by the agency Rijksdienst voor het Cultureel Erfgoed acting for the Dutch Ministry of Education, Culture and Science.-History and criteria:...

, number 39347.

History

De Oegekloostermolen was first marked on a map dated 1830. It was built to drain the 90 pondemaat Hartwerd-West polder. A restoration was carried out in 1970 by millwright

Millwright

A millwright is a craftsman or tradesman engaged with the construction and maintenance of machinery.Early millwrights were specialist carpenters who erected machines used in agriculture, food processing and processing lumber and paper...

 Westra of Franeker

Franeker

Franeker is one of the eleven historical cities of Friesland and capital of the municipality of Franekeradeel. It is located about 20 km west of Leeuwarden on the Van Harinxma Canal. As of 1 January 2006, it had 12,996 inhabitants. The city is famous for the Eisinga Planetarium from around...

. In 1981, the mill was sold by the Knol brothers to De Hollandsche Molen

De Hollandsche Molen

Vereniging De Hollandsche Molen is a Dutch organization founded in 1923 to preserve windmills in the Netherlands, to document them, and to restore them. Financial support comes from members and from grants by organizations such as the BankGiro Loterij...

. In 1986, Westra fitted a new roof and sails to the mill A furthe restoration in 1985 put the mill back into full working order. The mill was working until 1989. On 17 May 1989 it was sold to Stichting De Fryske Mole (Frisian Mills Society). The mill is kept in reserve should it be needed to drain the polder.

Description

De Oegekloostermolen is what the Dutch describe as an spinnenkop. It is a hollow post mill on a single storey octagonal roundhouse, one of only four in Friesland. The mill is winded by tailpole and winch. The roundhouse and mill body are boarded, while the roof is covered in horizonal weatherboards. The sails are Common sails. They have a span of 9.1 metre. The sails are carried on a wooden windshaft The windshaft also carries the brake wheel which has 33 cogs. This drives the wallower (16 cogs) at the top of the upright shaft. At the bottom of the upright shaft, the crown wheel, which has 27 cogs drives a gearwheel with 28 cogs on the axle of the Archimedes screw. The axle of the Archimedes screw is 230 millimetre diameter. The screw is 800 millimetre diameter and 3.2 metre long. It is inclined at 25°. Each revolution of the screw lifts 106 litres (23.3 imp gal) of water.