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|collection = [[Science Museum Group]]
|___location = [[Science Museum, London]]
|accession = 1861-46<ref >{{Cite web
|title=Rotative steam engine by Boulton and Watt, 1788.
|website=Science Museum
|url=http://www.sciencemuseum.org.uk/objects/motive_power/1861-46.aspx
}}</ref>
|working = No
}}
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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" />
== Innovations ==
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{{Commons category|The Lap Engine}}
{{Reflist|colwidth=35em|refs=
<ref name="SM, Lap Engine" >{{Cite web
|title=Rotative steam engine by Boulton and Watt, 1788.
|website=Science Museum
|url=http://www.sciencemuseum.org.uk/online_science/explore_our_collections/objects/index/smxg-50948
}}</ref>
<ref name="Dickinson & Jenkins, 1927" >{{cite book
|last=Dickinson |first=H.W.
| |||