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It is important as both an early example of a beam engine by [[Boulton and Watt]], and also mainly as illustrating an important innovative step in their development for its ability to produce rotary motion.<ref name="Dickinson & Jenkins, 1927" /><ref name="Crowley, Lap Engine" />
The engines name comes from its use in [[Matthew Boulton]]'s [[Soho Manufactory]], where it was used to drive a line of 43 polishing or [[lapping]] machines, used for the [[Birmingham toy industry|production of buttons and buckles]].<ref name="SM, Lap Engine" /><ref name="Hulse, web, Lap Engine" />
== Innovations ==
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[[File:Boulton and Watt centrifugal governor-MJ.jpg|thumb|upright|]]
{{Details|Centrifugal governor}}
<ref name="Hulse, Rotary, Lap Engine" />
{{clear right}}
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|website=Science Museum
|url=http://www.sciencemuseum.org.uk/online_science/explore_our_collections/objects/index/smxg-50948
}}</ref>
<ref name="Hulse, web, Lap Engine" >{{Cite web
|title=The Lap Engine
|author=David Hulse
|url=http://www.davidhulse.co.uk/543/The-Lap-Engine/
}}</ref>
<ref name="Hulse, Rotary, Lap Engine" >{{Cite web
|title=The Development of Rotary Motion by Steam Power
|first=David |last=Hulse
|chapter=The Lap Engine
|publisher=TEE Publishing
|isbn=1857611195
|year=2001
|url=http://www.davidhulse.co.uk/551/David-Hulse---About-My-Books/
}}</ref>
<ref name="Dickinson & Jenkins, 1927" >{{cite book
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