Theory of Machine
In elliptical trammels

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

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Theory of Machine
In a hydrodynamic journal bearing, there is

A thick film of lubricant between the journal and the bearing
A forced lubricant between the journal and the bearing
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
No lubricant between the journal and the bearing

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