Theory of Machine
In a four bar chain or quadric cycle chain

Two are turning pairs and two are sliding pairs
Each of the four pairs is a turning pair
Three are turning pairs and one is a sliding pair
One is a turning pair and three are sliding pairs

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Theory of Machine
The maximum fluctuation of speed is the

Difference of the maximum and minimum speeds
Sum of maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed
Variations of speed above and below the mean resisting torque line

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