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BELL SYSTEM TECHNICAL JOURNAL 



The method of splicing the copper wire is by means of a transformer, 

 the low voltage side of which is equipped with clamps for holding the 



Fig. 9 — Heavy wire insulator 



two ends of wire which are butted together, heated by electric current 

 and brazed by the application of borax flux and silver alloy solder. 

 The transformer windings are so designed with low internal resistance 



