De Hoop ( en, The Hope) is a smock mill in

Readtsjerk Readtsjerk ( nl, Roodkerk) is a village in the Dantumadiel municipality of Friesland, the Netherlands. It had a population of around 185 in 2017. The village consists of a few small and sparsely populated neighborhoods and has no real residentia ...

Friesland Friesland (, ; official fry, Fryslân ), historically and traditionally known as Frisia, is a province of the Netherlands located in the country's northern part. It is situated west of Groningen, northwest of Drenthe and Overijssel, north of ...

Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...

which was built in 1911. The mill has been restored to working order. It is listed as a Rijksmonument.

History

''De Hoop'' was originally built in 1863 at Scharmer, Groningen. The mill was moved in 1895 and was moved to Readtsjerk in 1911, replacing an earlier mill on the site. In 1961, the mill was mechanised, with a new steel

Archimedes' screw The Archimedes screw, also known as the Archimedean screw, hydrodynamic screw, water screw or Egyptian screw, is one of the earliest hydraulic machines. Using Archimedes screws as water pumps (Archimedes screw pump (ASP) or screw pump) dates back ...

replacing the former wooden one. A

diesel engine The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-ca ...

was installed. The engine was later removed and installed in the Wijnsermolen, Wyns. The mill was fitted with

Patent sails Windmills are powered by their sails. Sails are found in different designs, from primitive common sails to the advanced patent sails. Jib sails The jib sail is found in Mediterranean countries and consists of a simple triangle of cloth wound rou ...

, which were replaced by

Common Sails Common may refer to: Places * Common, a townland in County Tyrone, Northern Ireland * Boston Common, a central public park in Boston, Massachusetts * Cambridge Common, common land area in Cambridge, Massachusetts * Clapham Common, originally com ...

in 1969. ''De Hoop'' was sold to

Stichting De Fryske Mole The Stichting De Fryske Mole ( en, Frisian Mills Foundation) 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 w ...

on 17 May 1972, the 3rd mill acquired by that organisation The mill is used to train people in the art of working windmills. In September 2010, the mill required repairs to its foundations. These required the temporary removal of the Archimedes' screw. The mill is listed as a Rijksmonument, №11697.

Description

''De Hoop'' is what the Dutch describe as a ''Grondzeiler''. It is a two-storey smock mill on a single storey base. There is no stage, the sails reaching almost to ground level. The mill is winded by tailpole and winch. The smock and cap are

thatch Thatching is the craft of building a roof with dry vegetation such as straw, water reed, sedge (''Cladium mariscus''), rushes, heather, or palm branches, layering the vegetation so as to shed water away from the inner roof. Since the bulk of ...

ed. The sails are

Common sails Common may refer to: Places * Common, a townland in County Tyrone, Northern Ireland * Boston Common, a central public park in Boston, Massachusetts * Cambridge Common, common land area in Cambridge, Massachusetts * Clapham Common, originally com ...

. They have a span of .The sails are carried on a

cast iron Cast iron is a class of iron– carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its color when fractured: white cast iron has carbide impur ...

''windshaft'', which was probably cast by H J Koning of Foxham, Groningen in 1991.. It also carries the ''brake wheel'' which has 59 cogs. This drives the ''wallower'' (30 cogs) at the top of the ''upright shaft''. At the bottom of the ''upright shaft'' there are two ''crown wheels'' The upper ''crown wheel'', which has 43 cogs drives an

via a ''crown wheel''. The lower ''crown wheel'', which has 38 cogs is carried on the axle of an Archimedes' screw, which is used to drain the polder. The axle of the screw is diameter and long. The screw is diameter. It is inclined at 15.5°. Each revolution of the screw lifts of water.

Public access

''De Hoop'' is open to the public by appointment.

References

{{Dantumadiel Windmills in Friesland Windmills completed in 1911 Smock mills in the Netherlands Windpumps in the Netherlands Agricultural buildings in the Netherlands Rijksmonuments in Friesland Octagonal buildings in the Netherlands