Editing Compound steam engine (section)

===Early work===
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*1781 – [[Jonathan Hornblower]], the grandson of one of [[Thomas Newcomen|Newcomen]]'s engine erectors in Cornwall, patented a double-cylinder compound reciprocating [[beam engine]] in 1781. He was prevented from developing it further by [[James Watt]], who claimed his own patents were infringed.<ref>Encyclopædia Britannica Online, retrieved 29 March 2007.</ref>
*1797 - [[Richard Trevithick]] develops an effective high pressure steam engine.<ref>{{cite web|url=https://www.asme.org/engineering-topics/articles/transportation/richard-trevithick |title=Richard Trevithick |website=Asme.org |access-date=2017-04-30}}</ref>
*1804 – [[Arthur Woolf]] develops the stationary ''Woolf high-pressure compound engine'', patented in 1805. The Woolf engine lessened the increased magnitude of the continual heating and cooling of a single-expansion high pressure steam engine that leads to inefficiency. It also solved the problem that the contemporary [[cast iron]] cylinders could not handle it well.