Theory of Machine
In a steam engine, the link constitutes a

Crank pin, crankshaft and flywheel
Piston, piston rod and cross-head
All of these
Connecting rod with big and small end brasses, caps and bolts

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

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
During which the follower returns to its initial position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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