Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is equal to zero
Resultant couple is equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force and resultant couple are both equal to zero

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

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