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BELL SYSTEM TECHNICAL JOURNAL 



must be controllable for the different sizes of wire, in order that after being 

 annealed it can be easily removed at the subsequent operation. 



The application of torque motors on several installations at Western 

 Electric to secure uniform tension in the product being taken upon a reel 

 had demonstrated this to be a very satisfactory form of takeup drive, as 

 the motor will slow down with build up of wire on the reel without changing 



Fig. 4 — No. 2 wire drawing machine — front view 



the wire tension to any appreciable extent. By changing the stator voltage 

 of this type of motor, the torque can be regulated to give tension suitable 

 for drawing the various sizes of wire within the capacity of the machine. 

 By a proper selection of motors, variations in speed, without undue heating, 

 can be obtained with a ratio of 1-1.8, which is of sufficient range to permit 

 the use of reels of 400 lb. capacity. 

 The next step was to determine the maximum speed at which wire might 



