Theory of Machine
The indicator using Watt mechanism is known as

Richard indicator
Thomson indicator
Thompson indicator
Simplex indicator

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

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
Of rotation of the cam for a definite displacement of the follower
Through which the cam rotates during the period in which the follower remains in highest position

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Theory of Machine
Oldham's coupling is the

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

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