![]() ![]() ![]() The sails are mounted on a cast iron windshaft weighing nearly 2 tons and power is transmitted through the brake wheel which in turn drives a smaller iron wheel called a wallower. A weight hung on the chain allows some self regulation in gusty conditions. The shutters are opened or closed to suit the strength of the wind and the power required. Sails have two rows of 24 pivoting shutters which are connected by the striking gear and controlled from ground level by the striking chain. The four patent sails have a span of 64 ft (19.5m) and each is 9 ft 6 ins. The eight bladed fantail is mounted at the rear and rotates the cap via gearing so that the sails always face into the wind. ![]() The cap is built on a heavy oak frame and runs round an iron curb on the top of the tower and is kept central by a set of six wheels. The mill cap adds another 11ft (3.3m) to the overall height. The tower is 20ft (6.1m) wide at its base and 12ft (3.7m) at the top, some 31ft (9.5m) above ground. The inside walls are plastered and lime-washed. Its walls are 2 ft (0.6m) thick at the ground floor and are tarred to keep out the rain. Thelnetham Windmill is a tower mill built of red brick.
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