| 1. | It usually consists of a percussive system and a rotative system.
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| 2. | Boulton & Watt developed the reciprocating engine into the rotative type.
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| 3. | Non-rotative beam engines also had no easy means to drive a centrifugal governor.
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| 4. | The limiting factor for this widening being mechanical considerations, especially shaft deflection at high rotative speeds.
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| 5. | It was equipped with two 125hp rotative beam engines built by J . Witham and Sons, Leeds.
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| 6. | The Henry Ford Museum in Dearborn, Michigan houses a Watt rotative engine manufactured in 1788 by Charles Summerfield.
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| 7. | Secondly, and the most interesting aspect, is the semi-rotative valve gear ( see below ).
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| 8. | The rotative beam engine is of the double-acting type with a beam of and a flywheel in diameter.
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| 9. | In a rotative beam engine, the piston is mounted vertically, and the piston rod drives the beam as before.
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| 10. | Between the years 1775 and 1800, Watt, in partnership with industrialist Matthew Boulton, produced some 500 rotative beam engines.
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