De Volharding () is a

smock mill The smock mill is a type of windmill that consists of a sloping, horizontally weatherboarded, thatched, or shingled tower, usually with six or eight sides. It is topped with a roof or cap that rotates to bring the sails into the wind. This t ...

Jislum Jislum is a village in Noardeast-Fryslân in the province of Friesland, the Netherlands. It had a population of around 65 in January 2017. Before 2019, the village was part of the Ferwerderadiel municipality. There is a restored windmill A ...

Friesland Friesland ( ; ; official ), historically and traditionally known as Frisia (), named after the Frisians, is a Provinces of the Netherlands, province of the Netherlands located in the country's northern part. It is situated west of Groningen (p ...

Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...

which was built in 1872. The mill has been restored to working order and designated as being held in reserve in times of emergency. It is listed as a

Rijksmonument A (, ) is a national heritage site of the Netherlands, listed by the agency Rijksdienst voor het Cultureel Erfgoed (RCE) acting for the Dutch Ministry of Education, Culture and Science. At the end of February 2015, the Netherlands had 61,822 l ...

, number 15632.

History

''De Volharding'' was built in 1872. It drained the Ald Piip

Polder A polder () is a low-lying tract of land that forms an artificial hydrology, hydrological entity, enclosed by embankments known as levee, dikes. The three types of polder are: # Land reclamation, Land reclaimed from a body of water, such as a ...

, which has an area of . The mill can pump water into the polder as well as draining water from the polder. The mill worked until 1955, after which it became derelict. On 28 December 1971, it was the first mill bought by

Stichting De Fryske Mole The Stichting De Fryske Mole (; ; ) is a foundation for the preservation of windmills in the Dutch province Friesland, owning 42 of the 124 windmills in Friesland and closely co-operating with the Gild Fryske Mounders with which it publishes a q ...

(). The mill was restored by

millwright A millwright is a craftsman or skilled tradesman who installs, dismantles, maintains, repairs, reassembles, and moves machinery in factories, power plants, and construction sites. The term ''millwright'' (also known as ''industrial mechanic'') ...

Tacoma of

Stiens Stiens is a town in the municipality of Leeuwarden, Netherlands. As of January 2017, the town had a population of about 7,545. Between 1944 and 2018, it was the capital of the municipality of Leeuwarderadeel. History The village was first mention ...

in 1973. A further restoration was undertaken in 1994. In 2000, a new

Archimedes' screw The Archimedes' screw, also known as the Archimedean screw, hydrodynamic screw, water screw or Egyptian screw, is one of the earliest documented hydraulic machines. It was so-named after the Greek mathematician Archimedes who first described it ...

was fitted by millwright H Kloosterman. In 2006, the mill was officially designated by Wetterskap Fryslân as being held in reserve for use in times of emergency.

Description

''De Volharding'' is what the Dutch describe as an ''grondzeiler''. It is a two-storey smock mill on a low brick base. There is no stage, the sails reaching almost to the ground. The mill is winded by tailpole and winch. The smock and cap are covered in vertical boards. The sails are Common sails. They have a span of . The sails are carried on a wooden ''windshaft''. The ''windshaft'' also carries the ''brake wheel'' which has 32 cogs. This drives the ''wallower'' (17 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 25 cogs on the axle of the Archimedes' screw. The axle of the Archimedes' screw is diameter. The screw is diameter and long. It is inclined at 19°. Each revolution of the screw lifts of water.

Public access

''De Volharding'' is open by appointment.

References

{{DEFAULTSORT:Volharding, Jislum Windmills in Friesland Windmills completed in 1872 Smock mills in the Netherlands Windpumps in the Netherlands Rijksmonuments in Friesland Octagonal buildings in the Netherlands