In order to fulfill these requirements, and recognizing 

 the impracticability of controlling t\A;ist in the cable under 

 load, it was decided to design an instrument housing circular 

 in cross-section concentric with the cable. 



In the absence of definite instrumentation details, the 

 size of the housing was fixed arbitrarily. A cylinder with 

 a minimum inside diameter of three inches, and a usable 

 inside length of 12 inches, to provide space for housing a 

 thermistor bridge and associated telemetry equipment, was 

 selected foe the preliminary design. Specifications were 

 prepared, and an assembly, shown in Figure 10, was procured 

 from the Marsh and Marine Manufacturing Company to demonstrate 

 the feasibility of the design. 



In this design, a mechanical clamping arrangement is used 

 to secure the armor wires, but the quality of performance of 

 this method has not yet been proven. Some difficulty can be 

 expected, since the inner and outer armor wires are not of 

 the same diameter. An alternate design, which shows consider- 

 able promise, consists of a poured fitting with epoxy as the 

 potting material. The David Taylor Model Basin has been 

 experimenting with a fitting of this type for some time and 

 have found it to be completely satisfactory. If it can be 

 established that a poured epoxy fitting will stand up for 

 long periods, then it would appear to be the best solution to 

 the armor-wire connector problem. 



42 



