Theory of Machine
Angle of action of cam is defined as the angle

Moved by the cam from beginning of ascent to the termination of descent
Through which the cam rotates during the period in which the follower remains in the highest position
Of rotation of the cam for a definite displacement of the follower
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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Theory of Machine
Oldham's coupling is the

Third inversion of double slider crank chain
Second inversion of double slider crank chain
Third inversion of slider crank chain
Second inversion of single slider crank chain

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