Theory of Machine
Transmission angle is the angle between

Input link and fixed link
Output link and fixed link
Output link and coupler
Input link and coupler

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

During which the follower returns to its initial position
Through which the cam rotates during the period in which the follower remains in the highest position
Of rotation of the cam for 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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