could conceivably vary between 0,05 and 0.3 depending on the 

 presence of water or some form of preservative on the cable. 

 This will be a factor in determining cable slippage. A further 

 problem could arise in connection with the clip design. If 

 the clips are made of spring steel to prevent permanent defor- 

 mation by traction-unit pressure, they may be hard enough 

 to damage the cable. A possible alternative is the use of 

 some type of plastic clip, but this requires further study 

 before actual selection of a clip design can be made. 



The "Caterpuller" appears to offer the best solution 

 to the design of an acceptable traction unit for the applica- 

 tion discussed in this report. There are, however, many 

 questions to be resolved before such a system can be considered 

 acceptable. These questions can be resolved only by experi- 

 ments with an existing "Caterpuller" unit in handling faired 

 cable under tension. 



Coping with the tension in the cable constitutes only 

 part of the over-all handling problem? the other part in- 

 volves storage of the cable on the low-tension side. One 

 method is to store the cable on one or more reels which might 

 be either separately driven or coupled to the load system to 

 provide a small amount of back tension. Approximately 1000 

 feet of three-quarter -inch faired cable could be stored on a 

 single, thin reel eight feet in diameter, with a two-foot 

 diameter core. By using six such reels, and breaking the 



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