The trestle of a post mill is the arrangement of the main post, crosstrees and quarterbars that form the substructure of this type of windmill. It may or may not be surrounded by a roundhouse. Post mills without a roundhouse are known as open trestle post mills.
A trestle mill is a variety of smock mill, usually without weatherboards, formerly used for drainage in the Norfolk Broads. Examples can be found at Horning, Ludham and St Olaves. A well preserved example of a timber crosstree, from the trestle of a medieval windmill, was excavated by archaeologists at Humberstone, near Leicester, in 2007.
References
Bibliography Farries, Kenneth G. (1982). Essex Windmills, Millers and Millwrightes. Vol. Two: A Technical Review. London and Edinburgh: Charles Skilton. ISBN 0-284-98637-2. Smith, Arthur C. (1990). Drainage Windmills of the Norfolk Marshes. Stevenage: Arthur Smith Publication. ISBN 0-9515766-0-7. Coles Finch, William (1933). Watermills and Windmills. London: C. W. Daniel. Thomas, J. (2008). "Excavation of a Medieval Post-Mill Mound at Manor Farm, Humberstone" (PDF). University of Leicester Archaeological Services. Retrieved 4 December 2022.



