Fantail windmill

A vertical fan of six to eight vanes which automatically operates the mechanism to turn the cap and keep the sails  of a windmill facing into the wind.

Photograph of a mid 18th century post mill in Garboldisham. The mill is now missing its sails.

Garboldisham Mill, a mid 18th century post mill. There is a large fantail to the rear of the building. (© NCC)