TQ3013 : Jill windmill, Clayton - patent sails
taken 15 years ago, near to Clayton, West Sussex, England
Clayton Windmills, known locally as Jack and Jill, stand on the South Downs above the village of Clayton, West Sussex. They comprise a post mill and a tower mill, and the roundhouse of a former post mill. All three are Grade II* listed buildings.
Jill Windmill, built in 1821 in Brighton and moved to its present site in 1852 is open to the public most Sundays whilst Jack Windmill, built in 1866, is privately owned,
Link
There are three main types of windmills found within Great Britain. Post mills, smock mills and tower mills.
The post mill is of a timber framed construction with weather-boarded sloping external walls. It was manually positioned by hand to face the wind, unlike the smock and tower mills which had pivoting top with a tail fan.
Windmill article Link