drag rolls 12 rather than the nip rolls 4 speed sensor 31 is located on drag roll 12 rather than on nip roll 4 the speed of the rolls from speed sensors 29 and 31 sensing the speed of the last set of driven rolls 13 and one of the drag rolls 12 is shown this speed is communicated through electric line connections 32 and 33 to control at 30 which senses the variation in a set ratio of speed between the driven roll and the nip roll this controller then communicates through line 34 to eddy current brake 3 to continuously proportionally control the speed of drag roll 12 by variation in the voltage to the eddy current brake 3 which acts as a brake on roll 12 through pulleys 7 and 35 and belt 8 using the apparatus and process of this invention to prepare 448 000 pounds of a predominantly amine terminated y cross section nylon yarn the following table shows the uniformity achieved by this invention compared to use of the prior art uncontrolled apparatus to prepare 437 000 pounds under similar operating conditions 34 c o v 34 means 34 coefficient of variation 34 which is defined as the standard deviation between samples times 100 divided by the arithmetic mean table______________________________________ this invention prior art______________________________________denier avg 17 3 17 4 c o v 2 8 3 3 number samples 46 49elongation avg 74 5 77 c o v 7 1 9 3 number samples 48 51tenacity avg 4 0 gpd 4 0 gpd c o v 5 9 7 3 number samples 48 51crimps inch avg 10 0 cpi 9 9 cpi c o v 7.