A cataract was a speed governing device used for single-acting beam engines, particularly (though not exclusively) Cornish engines. The earlier atmospheric engines also used cataracts, but these worked on a different principle.
A cataract was a speed governing device used for single-acting beam engines, particularly (though not exclusively) Cornish engines. The earlier atmospheric engines also used cataracts, but these worked on a different principle.
Source: Wikipedia "Cataract (beam engine)" · CC BY-SA 4.0
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