Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

(r/2) cosφ
r tanφ
r cosφ
r sinφ

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Theory of Machine
In elliptical trammels

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

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