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BELL SYSTEM TECHNICAL JOURNAL 



take-up mechanism rotates the core of an empty spool at a speed 

 synchronous with the speed of the wire as it leaves the drawing capstan. 

 As the spool fills and the speed tends to increase, the wire on the ten- 

 sion arm tightens and compresses the tension arm against a spring 

 adjusted for the proper gauge of wire. 1 his in turn reduces the pres- 

 sure of the clutch driving the take-up spindle, permitting the spool of 

 wire to readjust its speed. 



50 31 



32 55 



54 55 56 37 

 Size (B & S Gauge) 



Fig. 15 



This device is extremely sensitive as illustrated in the drawing of 

 No. 42 B. & S. wire at 2000 feet per minute, in which case the control 

 arm must be adjusted to operate between 90 and 150 grams, since the 

 pull required is 87 grams and the breaking strength of the wire is 170 

 grams. This device is so flexible that it can be adjusted to a drawing 



