TRANSATLANTIC TELEPHONE CABLE — AFFEL 



287 



standpoint. On the route chosen the cable will be laid overland to 

 Terrenceville at the head of Fortune Bay, thence, picking up the 

 inshore route, in water of moderate depth to Sydney Mines. This 

 part of the system thus falls into two sections: to the east about 62 

 statute miles overland and to the west about 274 nautical miles in 

 coastal water in depths of about 250 fathoms.' The single cable will 



NEWFOUNDLAND 



^° SVOrvey MINES 



Figure 4. — Newfoundland. 



TO NOVA SCOTIA 



be equipped with 16 repeaters; 2 of these will be on land. Each 

 repeater consists of a combination of amplifiers and filters in order 

 to separate the different frequency currents in the opposite directions 

 so that, in effect, the two directions of speech can be independent even 

 though they pass over the same cable structure. 



CIRCUIT CAPACITY 



Figure 5 shows the location of the various frequency bands used for 

 transmission. The cables between Clarenville and Oban will have 

 transmission frequency bands extending from 20 to 164 kilocycles per 

 second (1 kilocycle equals 1,000 cycles). This, when used with the 

 proper carrier-system equipment at the terminals, will provide capac- 

 ity for 36 carrier telephone circuits at 4-kilocycle spacing. 



The circuit capacity of the cable between Clarenville and Sydney 

 Mines will be somewhat greater because it is planned to transmit the 

 frequency band 20 to 260 kilocycles per second from Sydney Mines to 



' 1 fathom=6 feet. 



