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

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

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Theory of Machine
In elliptical trammels

Two pairs turning and two pairs sliding
All four pairs are turning
Three pairs turning and one pair sliding
One pair turning and three pairs sliding

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