8 BELL SYSTEM TECHNICAL JOURNAL 



only a limited amount of wire necessitated the working out of a de- 

 pendable means for shifting from an empty to a full spool without a 

 shutdown or break in conductor or insulation. This is accomplished 

 by taking the wire off over the head of a spool by means of a flyer and 

 brazing the inner end of the wire on one spool to the outer end of the 

 next. Again in spooling the finished material at the dry end, the wire 

 must be transferred from a full spool to an empty without interfering 

 with the operation of the machine. This has been taken care of very 



Fig. 4 — Changing spools at supply end. 



simply by providing two spool positions for each wire with a simple 

 manual means of shifting from one to the other. 



Broken Wires 

 In spite of all the care that can be exercised, wires break at times 

 and as a matter of economy, methods of restringing the broken wires 

 with the machine in operation had to be worked out. Continuous six- 

 day week operation is now possible without shutdowns except for the 

 midweek clean-up. 



