
The smock mill is a type of windmill that consists of a sloping, horizontally weatherboarded or thatched tower, usually with six or eight sides. It is topped with a roof or cap that rotates to bring the sails into the wind. This type of windmill got its name from its resemblance to smocks worn by farmers in an earlier period. ==Construction== Smoc...
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http://en.wikipedia.org/wiki/Smock_mill

A smock-mill is a form of windmill in which a cap rotates on a vertical axis to present the sails towards the wind. The name is used in contradistinction to a postmill in which the whole mill rotates for the same purpose.
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http://www.probertencyclopaedia.com/browse/GS.HTM
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