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	thrust bearing of the SS John Oxley built in 1927
	Until the 1920es propeller thrust had been transmitted from a series of plane-faced collars attached to the shaft. These collars made direct contact with a corresponding series of shoes (like horse shoes) which were mounted in a massive housing bolted to the frame of the ship. As wear took place in an orgy of frictional destruction, the shoes were adjusted to maintain some degree of uniformity of contact with the collars. The allowable load bearing was between 40 and 55 Ibs. per square inch, an intensity of loading about one-tenth of the allowable load of a Michell bearing. The co-efficient of resistance was 10-20 times greater than in Michell bearings, which, according to the particular application were able to operate with sliding speeds from 5-30 times faster than were the old shoe and collar bearings. The unique feature of the Michell invention was the tilting slipper pad. The typical bearing has a ring of sector shaped pads making contact with a fixed collar by a pivot or balljoint. A collar attached to the shaft, bears against the pads, but as the shaft rotates, oil is introduced between collar and pad; the latter tilts on its pivot and assumes an attitude whereby a wedge shaped film of oil is permanently interposed between collar and pad. The bearing load is taken by this oil film, thus eliminating metal to metal contact.

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