Theory of Machine
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

Parallel to each other
Inclined at 45°
Perpendicular to each other
Opposite to each other

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Theory of Machine
In elliptical trammels

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

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