Theory of Machine
A watt's governor can work satisfactorily at speeds from

80 to 100 r.p.m.
100 to 200 r.p.m.
200 to 300 r.p.m.
60 to 80 r.p.m.

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Theory of Machine
Crowning on pulleys helps

In decreasing the slip of the belt
For automatic adjustment of belt position so that belt runs centrally
In increasing velocity ratio
Increase belt and pulley life

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