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

Hartung governor
Wilson Hartnell governor
Inertia governor
Pickering governor

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Theory of Machine
Hammer blow

Varies inversely with the square of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies as the square root of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

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