Theory of Machine
The indicator using Watt mechanism is known as

Thompson indicator
Simplex indicator
Thomson indicator
Richard indicator

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Theory of Machine
Crowning on pulleys helps

In decreasing the slip of the belt
Increase belt and pulley life
In increasing velocity ratio
For automatic adjustment of belt position so that belt runs centrally

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Theory of Machine
Cam angle is defined as the angle

Through which, the cam rotates during the period in which the follower remains in the highest position
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

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