This horizontal mill engine (a type of engine commonly used in small factories and mills around the mid-19th century) was made by J.I. Headly. The Headlys were one of the major iron founding families of Cambridge. It is probably the last engine to have been cast by J.I. Headly at the Eagle Foundry on Mill Road. The engine spent its entire working life at Thomas Evans Leather Works (1860-1968) in Sawston, where it was used to run the stocks and splitting machine. The power was transmitted from the engine to the machinery via a system of flat belt-driven line shafting. Evans stopped using it in 1968 when they modernised their works. The mill engine was restored to working order in the late 1980s.
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