Journal bearing apparatus consists of a plain steel shaft excavated in a bearing and directly driven by an HP motor. The journal bearing apparatus is freely supported on the shaft and sealed at the motor end. The speed of the motor is controlled accurately by the speed control unit and it can be made run in both directions. Twelve equal-spaced pressures taping around the circumference and four along the axis are provided and are connected to manometer by pu tubing so that the pressure head of oil in all tubes can be observed at a time. The bearing can be loaded by attaching weights to the arm supported beneath it.