The case history in this section of the book discussed a large two-pole motor, operating on a 60 Hz-power, sleeve-bearing machine with high axial vibration at 7,200 cpm. The motor was 2,500 hp, and it was coupled through a fluid coupling, with ball bearings, for speed control, to a boiler feed pump. The motor axial vibration, taken on the motor end bracket housing, was 0.6 inch/s velocity. The axial on the inboard side of the fluid drive was 0.04 inches/s velocity! Explain how that much vibration in the axial direction on the motor could all but disappear on the fluid drive inboard axial.