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.
The primary function of a. bearing is to carry load between a rotor and the case with as little wear as possible. This bearing function exists in almost. every occurrence of daily life from the watch on your wrist to the automobile you drive to the disk drive in your. computer. In industry, the use of journal bearings is specialized for rotating machinery both low and high speed.