Theory of Machine
In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed

Inertia governor
Pickering governor
Wilson Hartnell governor
Hartung governor

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Theory of Machine
Crowning on pulleys helps

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

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