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Glossary

Glossary of Windmill Terms

Bin floor

The floor above the stone floor where grain is stored in bins

Body

The upper part which revolves on the post and contains the working machinery


Crowntree

The main timber which rests and pivots on the post and carries the weight of the body


Crosstree

Horizontal members in a timber trestle supporting a post mill


Fan tail

A device for turning the mill automatically into the wind consisting of six or eight shaped vanes or blades


French Burr

A millstone made in France from a number of blocks or segments of quartz cemented together


Peaks

Millstones made from a single block of millstone grit quarried in Derbyshire


Post Mill

A mill consisting of a timber building, known as the
body or buck, supported on a vertical post which acts as a pivot so
that the mill can be turned to face the wind


Roundhouse

Brick building enclosing the trestle of the mill


Sails

The part which is turned by the wind, usually consisting of a timber frame in which moveable shutters are fitted


Side girts

The heavy horizontal timbers which run from front to
back on each side of the body of the mill resting on the ends of the
crown tree and supporting the corner posts.


Spout floor

The floor to which the meal descends from the millstones on the floor above.


Stocks

The heavy timbers which pass through the sail canister and to which whips of the sails are fixed


Stone floor

The floor on which the millstones are situated


Stones

Millstones used for grinding grain comprising bedstone and runner stone


Sweep governor

A device for regulating the shutter openings


Sweeps

Another term for sails


Tail pole

The long pole projecting at the rear of the mill by which it can be turned into the wind


Tail stones

Millstones situated at the rear of the body


Tail wheel

The rear driving wheel on the windshaft which has a second pair of stones


Trestle

The sub-structure comprising post, quarter bars and cross trees


Trestle floor

The floor level containing the trestle


Windshaft

The shaft on which the sails and brakewheel are mounted

Source: A glossary of windmill and milling terms by Norman Plastow, Wimbledon Windmill Museum