from the steam.

Invented in 1781, this technique was first employed on a Cornish beam engine in 1804. Around 1850, compound engines were introduced into Lancashire textile mills.

Compound systems

There are many compound systems and configurations, but there are two basic types, according to how HP and LP piston strokes are phased and hence whether the HP exhaust is able to pass directly from HP to LP (Woolf compounds) or whether pressure fluctuation

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