A NEW KEY WEST— HAVANA CARRIER TELEPHONE CABLE 203 



that there is no advantage from the standpoint of the reduction of 

 atmospheric and other extraneous interference to be had from the 

 use of an unbalanced twin-core termination in a cable provided with 

 copper return tapes. A balanced twin-core termination would be 

 effective in reducing interference but certain disadvantages would be 



TYPE D 

 DEEP SEA 



-22 STEEL WIRES COVERED 

 WITH FABRIC TAPE 



COPPER RETURN TAPE 

 WEIGHT 845 LBS. PER N.M 



COPPER PROTECTIVE TAPE 

 OVERLAPPED 



PARAGUTTA 



WEIGHT 677 LBS. PER N.M, 



COPPER WIRE 

 SURROUNDED BY COPPER TAPES 

 TOTAL WEIGHT SOS LBS. PER N.M 



TYPE B 

 INTERMEDIATE 



16 IRON WIRES- 



TYPE A 

 SHORE END 



'^,-^:x 



COPPER WIRE- 



SURROUNDED BY COPPER TAPES 

 TOTAL WEIGHT 506 LBS. PER N.M. 



PARAGUTTA 



WEIGHT 677 LBS. PER N.M 



COPPER PROTECTIVE TAPE 

 OVERLAPPED 



COPPER RETURN TAPE 

 WEIGHT 845 LBS. PER N. 



LEAD SHEATH 



TYPE A 



SHORE END 



CORE LEAD COVERED 



-<: 



X 



N0TE:-THE WEIGHTS GIVEN ARE IN POUNDS PER 

 NAUTICA^ MILE (l.lS3 STATUTE MILES). 



Fig. 3 — Cross-sections of the various types of cable. 



connected with its use. \'ery little shielding beyond that naturally 

 furnished by the sea water is needed and that additional amount is 

 furnished by a wrought iron pipe enclosing the cable between the cable 

 hut and the level of the lowest tides. 



Carrier System 

 As noted previously, in providing carrier apparatus to make use of 

 the high-frequency transmission properties of the new cable, an effort 



