Theory of Machine
Klein's construction can be used when

Crank has uniform angular velocity and angular acceleration
Crank has uniform angular acceleration
Crank has non-uniform velocity
Crank has a uniform angular velocity

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Open belt drive is recommended
Both open belt drive and crossed belt drive is recommended
Crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted

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