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BELL SYSTEM TECHNICAL JOURNAL 



coils arranged on one of the spindles which will be placed in the iron 

 pot also shown. This particular pot will hold 7 spindles and when 

 they are in place, the pot will be filled with compound and thoroughly- 

 sealed. 



Telephone Repeaters 

 Even with the improvement in the quality of transmission and 

 reduced attenuation losses effected by the use of loading coils, loaded 



Fig. 19 — Loading Coils on Spindle, Iron Loading Coil Case and Spindle Cables 



cable circuits alone of No. 16 and No. 19 A. W. G. could be satisfac- 

 torily operated for distances less than 100 and 60 miles, respectively, 

 and this is far short of our requirements in this case. In fact, we wish 

 to operate some telephone circuits on these conductors and through this 

 cable and future cables up to at least 1000 miles in length. This 



