Theory of Machine
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

cotφ - cotα = c/b
tanφ + cotα = b/c
cosφ - sinα = c/b
sinφ + sinα = b/c

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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 length of effective stroke of piston
Cause withdrawing or throttling of steam
Reduce maximum opening of port to steam

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