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.
Glossary â Cylindrical Roller Bearings. 1  NU style single row â NU style bearings have two machined flanges on the outer ring and no flanges on the inner ring. 2  N Style single row â N style bearings have two machined flanges on the inner ring and no flanges on the outer ring, with rollers and cage on the inner ring.