The sheet shows a full-size plan and full-size detail sections A-A and Y-Y of the threshold. There is no author or date marked on the sheet, but it is likely to have been created by the Ministry of Public Buildings and Works, between 1962 and 1970.
This is part of the Volume: PF/DMT Martello Tower Number 24, Dymchurch, Kent; within the Series: EHC01/022 English Heritage Plans and Measured Drawings; within the Collection: EHC01 English Heritage(EH):Archive
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Georgian Martello Tower