Observations taken at a small water mill at Hitchin/[Joshua Field?] 1809 Sept 14. [The document analyses the work output and efficency of the water mill and includes pencil sketches and calculations]
Observations taken at a small water mill at Hitchin/[Joshua Field?] 1809 Sept 14. [The document analyses the work output and efficency of the water mill and includes pencil sketches and calculations]