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===Mill Engines===
{{main|Stationary steam engine}}
Though the first mills were driven by water, steam was soon adopted freeing the manufacturer from using sites by running water. Cotton spinning required ever larger mills to fulfil the demand, and this drove the owners to demand increasingly powerful engines. When boiler pressure had exceeded 60psi compounds achieve a thermo-dynamic advantage, but it was the mechanic advantages of the smoother stroke that was the deciding factor in the adoption of compounds. In 1859, there was 75,886 ihp of engines in mills in the Manchester area, of which 32,282 ihp was provided by compounds though only 4,1189 ihp was generated from boilers operated at over 60psi. <ref>{{Harvnb|Hills|1987|p=160}}</ref>
We can generalise and say that from 1860 until 1926, all Lancashire mills wer diven by compounds. The last compound built was for [[Wye No.2 mill,Shaw]] by [[Buckley and Taylor]], it was a cross compound designed to 2,500 ihp. It drove a 24ft, 90 ton flywheel it ran until 1965.<ref>{{Harvnb|Hills|1987|p=281}}</ref>
===Marine applications===
{{main|Marine steam engine}}
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