ADDENDUM C-U 



Underwater Detector Assembly 



The underwater detector assembly, shown in Figs. C-10 and C-ll, is 

 constructed of mild steel, except for the detector housing, which is 

 constructed of stainless steel. The final assembly is plated with 

 nickel (electroless process) to prevent excessive corrosion. Careful 

 attention is given to axle and bearing tolerances because the detector 

 housing must swing freely as a pendulum. A 1/ 2- in. -thick lead plate is 

 used at the bottom of the detector housing to aid in holding the detec- 

 tors in a vertical position. Conductor cables are passed through the 

 hollow axle and around a towing torque . The cable entry is sealed with 

 epoxy resin to prevent water from entering the detector housing. 



C-28 



