Athenian cultural dominance continued throughout the Roman period, and the buildings added to the Agora reflect the educational role of the city, a role that ended only with the closing of the pagan philosophical schools by the Christian emperor Justinian in A.D. 529.
Bearing, in machine construction, a connector (usually a support) that permits the connected members to rotate or to move in a straight line relative to one another. Often one of the members is fixed, and the bearing acts as a support for the moving member. Most bearings support rotating shafts against either transverse (radial) or thrust (axial) loads.
What Is A Wheel Bearing? On your car, the bearing supports the wheel and rides on the axle shaft. It fits into the hollow section at the center of the wheel, and is held in place by the lug bolts which attach the wheel to the car. The wheel bearing is pressed into the back of the wheel, before being bolted into place.