Theory of Machine
Klein's construction can be used to determine acceleration of various parts when the crank is at

All of the listed here
Inner dead centre
Outer dead centre
Right angles to the link of the stroke

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Theory of Machine
The contact ratio is given by

(Length of the arc of approach)/cosφ
(Length of path of recess)/(Circular pitch)
(Length of the arc of contact)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)

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