Theory of Machine
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is +ve and b is also +ve
a is +ve and b = 0
a = 0 and b is +ve
a is +ve and b is -ve

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Theory of Machine
Crowning on pulleys helps

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

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