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BELL SYSTEM TECHNICAL JOURNAL 



overall efficiency of the drying operation. As shown by the curves in 

 Fig. 4, 4 amperes per 19-gauge wire or equivalent provided about the 

 lowest equipment cost. The heating period under this starting cur- 



Flg. 5 — D-C. power panel. The contactors in the upper row connect the gen- 

 erators either in parallel or in series. The contactors in the lower row connect the 

 power supply to any of three dryers. All contactors are operated by switches on 

 the control panel. 



rent density was approximately one-half hour, which fitted very well 

 into the plan for servicing the lead presses with dry cable cores. 



In determining the type of equipment it was decided to provide 

 two generators on the set. For the shorter lengths of large cable 



