De Poelen or De Puollen is a smock mill in Dronrijp

Dronrijp

Dronrijp is a town in the Dutch municipality of Menaldumadeel. On January 1, 2008, it had 3,405 inhabitants.-History and architecture:A few centuries BC, a settlement developed around where the street Tsjerkebuorren is now . Another settlement came into existence nearby when a canal between...

, 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 in 1850. The mill 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 28612.

History

De Poelen was built in 1850. It was built to drain the 365 hectares (901.9 acre) Oosterpolder. During its working life, the mill was fitted with Patent sails which had Dekkerised leading edges. The mill was restored in 1984-85, after years out of use and in decline. De Poelen was officially reopened on 27 April 1985. The mill now only pumps water in a circuit for demonstration purposes.

Description

De Poelen is what the Dutch describe as a "grondzeiler" . It is a three storey smock mill on a single storey base. There is no stage, the sail reaching almost to the ground. The smock and cap thatched. The mill is winded by tailpole and winch. The sails are Common sails. They have a span of 19.1 metre. The sails are carried on a cast iron windshaft, which is bored through to take the striking rod for Patent sails. The windshaft also carries the brake wheel which has 58 cogs. This drives the wallower (35 cogs) at the top of the upright shaft. At the bottom of the upright shaft, the crown wheel, which has 53 cogs drives a gearwheel with 38 cogs on the axle of the Archimedes screw. The axle of the screw is 350 millimetre diameter and the screw is 1.5 metre diameter and 4.5 metre long. The screw is inclined at 20°. Each revolution of the screw lifts 919 litres (202.2 imp gal) of water.