of the homogenizing pump 70 different blade lengths 71 blade overlap 72 and extension of the blades 73 below the rotating hub 9 are all shown the use of different blade lengths 71 in the same pump facilitates homogenizing performance over a wide range of rotational speeds blade overlap 72 and the extension of the blades 73 below the rotating hub 9 affect the homogenizing performance of the pump additional blade configurations include but are not limited to arranging the blades in a helical pattern or in a partially randomized pattern 0045 fig8 shows an example of a two stage device 80 with one auger pump stage 81 and one homogenizing pump stage 82 this design would be especially useful in an application where the requirements include both high process pressure and a high degree of glass homogeneity process flow and pressure is achieved using the auger pump stage 81 while the homogenizing pump stage 82 effectively mixes the glass as in the earlier examples glass that moves slowly along the inner body of the molten glass pump at the base of the blades comes out of the distal output end of the pump body and forms a tip cord defect the two stage device 80 adds a hole 83 in the center of the pump body to return this unmixed glass to an intermediate point in the pump for mixing into the stream the placement of the hole 83 at an intermediate point in the pump could also be used with the previous embodiments these devices may be used singly or coupled in series as a multi stage device to produce a system which will fulfill the required specifications accordingly it is to be understood that the.