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

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Theory of Machine
Open pairs are those which have

Two elements that permit relative motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically
Surface contact between the two elements when in motion

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