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Updated: October 3, 2026
Watt, though greatly irritated, was not discouraged. His engines were not, in the first place, like Newcomen's, mere pumps, mere draining-pumps. In a few years he transformed them into universal motive powers, and of indefinite force. His first step in this line was the invention of a double-acting engine (
The construction of draining-pumps of very large dimensions was soon undertaken there, and repeated experiments showed that, with equal effect, they saved three-quarters of the fuel that was consumed by Newcomen's previous engines. From that moment the new pumps were spread through all the mining counties, especially in Cornwall.