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.
There's nothing mysterious about wheel bearings, even though they're not something most drivers are accustomed to seeing. Wheel bearings are simply a set of steel balls kept in place by a metal ring called a race.Their job is to enable the wheel â or wherever else they're attached â to spin with as little friction as possible. On a vehicle, they sit between the axle and the wheel, enabling the wheel and hub to spin freely on the axle.ne indication that a wheel bearings replacement job is in your vehicle's future is the appearance of wheel bearing noise. That noise could be an early warning that a wheel bearing is about to fail.