Theory of Machine
In elliptical trammels

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

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Both (A) and (B)
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
The Ackerman steering gear is most economical
The Ackerman steering gear consists of turning pairs

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