Theory of Machine
In elliptical trammels

Two pairs turning and two pairs sliding
Three pairs turning and one pair sliding
One pair turning and three pairs sliding
All four pairs are turning

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Theory of Machine
Hammer blow

Varies as the square root of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies inversely with the square of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

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