Theory of Machine
Efficiency of a screw jack is given by

tanα/tan (α +φ)
tan (α + φ)/tanα
tan (α - φ)/tanα
tanα/tan (α - φ)

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Theory of Machine
Oldham's coupling is the

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

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