Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Rotary engine
Elliptical trammels
Universal joint
Whitworth quick return mechanism

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
None of these
The algebraic sum of the secondary forces must be equal to zero

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