A CARRIER TELEPHONE SYSTEM FOR TOLL CABLES 



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in Figs. 16a and 16b, respectively. Many of the existing voice- 

 frequency stations are even larger than that shown in Fig. 16a. The 

 auxiliary building shown in Fig. 16b has about 600 feet of floor space 



Fig. 16a — Voice frequency repeater station on single cable route. 



with a ceiling height sufficient to take care of 11'6" relay racks. This 

 building will house 100 repeaters with necessary auxiliary equipment, 

 thus providing ultimately for a total of 1200 carrier circuits. The 

 interior of a typical auxiliary station is shown in Fig. 17. 



Fig. 166 — Auxiliary cable carrier repeater station. 



The main power plant for the repeaters consists of a 152-volt 

 storage battery, which is continuously floated across a grid-controlled 

 rectifier fed from the 60-cycle power mains. The voltage of the entire 



