Theory of Machine
The power of a Porter governor is equal to

[4c²/(1 + 2c)] (m + M) g.h
[3c²/(1 + 2c)] (m + M) g.h
[2c²/(1 + 2c)] (m + M) g.h
[c²/(1 + 2c)] (m + M) g.h

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Theory of Machine
The maximum fluctuation of energy is the

Variations of energy above and below the mean resisting torque line
Ratio of the mean resisting torque to the work-done per cycle
Difference between the maximum and minimum energies
Sum of the maximum and minimum energies

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