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=== Sun and planet gear ===
[[File:Sun and planet gear science museum.JPG|thumb|The [[
{{Details|Sun and planet gear}}
The [[rotative beam engine]] needs a means to convert [[reciprocating motion]] of the piston and beam to [[rotary motion]]. The [[crankshaft]] was well known for centuries before Watt, mostly from its use in mining machinery powered by [[water wheel]]s. However its use for a steam engine was covered by [[James Pickard]]'s patent at this time.<ref>{{Cite book
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