A SUBMARINE TELEPHONE CABLE WITH SUBMERGED REPEATERS 



69 



Also, as a consequence of the cable tension, the armor unlays somewhat; 

 and this imposes twist and elongation on the interior structure, either coaxial 

 circuit or repeater housing. The cable circuit can be designed to withstand 

 this distortion, but the repeater housing is much more susceptible to damage 

 from this cause. 



The Repeater Housing 



The requirements on flexibility and water-tightness under ocean bottom 

 pressures were the factors of outstanding influence in the design of the re- 



Fig. 2 — Steel rings and copper envelope of repeater. 



peater housing and of the end seals by means of which the cable enters and 

 leaves the housing. In the present form the housing consists of a long tube 

 of soft copper If inches in diameter and .03 inch thick, supported internally 

 against collapse under sea bottom pressure by an assemblage of abutting 

 steel rings, each f '' wide, and given a degree of rigidity by means of thinner 

 steel rings of the same width overlaying and staggered relative to the thicker 

 rings. When this structure is sealed at the ends it is capable of withstanding 

 pressures as high as 10,000 pounds per square inch and it can be bent to a 

 radius as small as three feet without undue distortion of the copper envelope. 

 Details of the structure are shown in Fig. 2. 



Into each end of the housing is led the insulated conductor of the cable by 



