Theory of Machine
The gear train usually employed in clocks is a

Sun and planet gear
Differential gear
Simple gear train
Reverted gear train

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

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

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