Theory of Machine
Lower pairs are those which have

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

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Theory of Machine
The Klein's method of construction for reciprocating engine mechanism

Is a simplified form of instantaneous center method
Is based on acceleration diagram
Enables determination of Cariole’s component
Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

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