Editing Watt steam engine (section)

==Preserved Watt engines==
The oldest surviving Watt engine is [[Old Bess (beam engine)|''Old Bess'']] of 1777, now in the [[Science Museum, London]]. 
The oldest working engine in the world is the [[Smethwick Engine]], brought into service in May 1779 and now at [[Thinktank, Birmingham|Thinktank]] in Birmingham (formerly at the now defunct [[Museum of Science and Industry, Birmingham]]).
The oldest still in its original engine house and still capable of doing the job for which it was installed is the 1812 Boulton and Watt engine at the [[Crofton Pumping Station]] in [[Wiltshire]]. This was used to pump water for the [[Kennet and Avon Canal]]; on certain weekends throughout the year the modern pumps are switched off and the two steam engines at Crofton still perform this function.
The oldest extant rotative steam engine, the [[Whitbread Engine]] (from 1785, the third rotative engine ever built), is located in the [[Powerhouse Museum]] in Sydney, Australia.
A Boulton-Watt engine of 1788 may be found in the [[Science Museum (London)|Science Museum, London]],<ref name="Science Museum, lap engine, 1788" >{{cite web
  |title=Rotative steam engine by Boulton and Watt, 1788
  |url=http://www.sciencemuseum.org.uk/objects/motive_power/1861-46.aspx
  |publisher=Science Museum
  |access-date=20 August 2008
  |archive-date=24 September 2015
  |archive-url=https://web.archive.org/web/20150924114903/http://www.sciencemuseum.org.uk/objects/motive_power/1861-46.aspx
  |url-status=dead
  }}</ref> while an 1817 [[blowing engine]], formerly used at the [[Netherton, West Midlands|Netherton]] ironworks of M W Grazebrook now decorates [[Dartmouth Circus]], a traffic island at the start of the [[A38(M) motorway]] in Birmingham.

[[The Henry Ford Museum]] in [[Dearborn, Michigan]] houses a replica of a 1788 Watt rotative engine. It is a full-scale working model of a Boulton-Watt engine.  The American industrialist [[Henry Ford]] commissioned the replica engine from the English manufacturer Charles Summerfield in 1932.<ref>{{cite web|title=Henry Ford Museum|url= https://www.thehenryford.org/collections-and-research/digital-collections/artifact/275719/}}</ref> The museum also holds an original Boulton and Watt atmospheric pump engine, originally used for canal pumping in Birmingham,<ref>{{cite web|title=Henry Ford Museum|url= https://www.thehenryford.org/collections-and-research/digital-collections/artifact/3174/}}</ref> illustrated below, and in use in situ at the Bowyer Street pumping station,<ref>{{cite web|title=Rowington Records|url=http://rowingtonrecords.com/Tiger/Canals/Warwick%20and%20Birmingham%20Canal/index.html#img=DSC00273.JPG|access-date=29 January 2018|archive-date=29 November 2020|archive-url=https://web.archive.org/web/20201129075436/http://rowingtonrecords.com/Tiger/Canals/Warwick%20and%20Birmingham%20Canal/index.html#img=DSC00273.JPG|url-status=dead}}</ref><ref>{{cite web |title=A pumping station, glassworks and pottery kiln at Ashted Circus |url=https://www.birmingham.gov.uk/info/50064/birminghams_archaeology/964/a_pumping_station_glassworks_and_pottery_kiln_at_ashted_circus |publisher=Birmingham City Council |access-date=14 February 2024 }}</ref> from 1796 until 1854, and afterwards removed to Dearborn in 1929.

Another one is preserved at [[Fumel]] factory, France.

<gallery class="center">
File:Grazebrook Beam Engine.jpg|The 1817 engine in [[Birmingham]], England
File:15 23 1056 ford museum.jpg|Watt atmospheric pump engine (1796) at [[The Henry Ford Museum]]
</gallery>