An account of an analysis of the effect of finely dispersed bubbles on the hydrodynamic lubrication of isoviscous straight pivot pads is presented. The bubble-effect is seen to shift the load center position, and more so for small tilts than for high ones. This is shown to establish two distinct operational modes for very realistic pivot positions, the one stable and the other unstable and representing the limit of stability of bubbly Michell bearings.

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