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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Theory of Machine
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will

All of the listed here
Reduce maximum opening of port to steam
Cause withdrawing or throttling of steam
Reduce length of effective stroke of piston

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