This thesis presents the results of an experimental investigation of the radial static pressure distribution associated with enclosed rotating disks with superimposed radial outward throughflow. The pressure distribution both on the rotating and stationary disks is examined for the case of turbulent flow with separate boundary layers. All the pertinent variables including the size of the disk are examined. The pressure distribution is found to be a strong function of each of the principal dimensionless parameters, namely the axial clearance-disk radius ratio, the disk Reynolds number, and the throughflow number. The data is presented in sufficient detail for use in design calculatlons for fluid machinery.