Willans engine
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The Willans engine or central valve engine was a high-speed stationary steam engine used mainly for electricity generation around the start of the 20th century.
Willans & Robinson engine, driving a dynamo generator
Vertical section
Sectioned cylinder, showing the central valve spindle
Unknown small central spindle engine, in an Indian museum
Steeple compound engine
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A steeple compound engine is a form of tandem compound steam engine that is constructed as an inverted vertical engine. Because of their great height, they became known as "steeple" engines.
Willans engine
…steam engine used mainly for electricity generation around the start of the 20th century. Willans' engine was one of the best-known examples of the steeple compound engine. These were double- or triple-expansion compound engines, with the unusual features of single-acting cylinders and a central spindle valve shared between…
Fitchburg steeple compound engine