the sensors and associated electronics. This section of the 

 housing is subjected to both an external "hydrostatic pres- 

 sure, acting on it radially, and an axial force. Iliis axial 

 force may be eitlier tensile or compressive depending on the 

 magnitude of the cable tension at the housing and the hydro- 

 static pressure acting on the sealed bulJchead located in the 

 end of the cylindrical instrximent compartment. The housing 

 nearest the surface, then, must sustain the highest tensile 

 loading, and the housing nearest the depressor, the greatest 

 compressive loading. However, to facilitate interchangeabil- 

 ity, it v/as decided that the housings should be designed to 

 sustain the miiximum load, either tensile or compressive. 



Since each housing is essentially a connecting link in 

 the cable, it was decided to design each to withstand a load 

 equal to the rated breaking strength (45, 000 pounds) of the 

 cable. Tlie maximum depth attainable by the housing nearest 

 the depressor would be^ at zero ship speed, just the length 

 of the cable. With the original estimated cable length of 

 6, 200 feet, the maximum pressure on the bottom housing would 

 have been 2, 795 psi; with 8, 000 feet of cable, the latest 

 estimate for the system, the maximum pressure would be 

 3, 556 psi. 



1.18 



