as to place a pull on the cable. The air pressure in the 

 loading cylinders was maintained at 110 psig for this 

 operation. The tension was noted and the air pressure in 

 the loading cylinders then slowly reduced until slippage 

 relative to the tracks was evidenced by a decrease in the 

 cable tension. As the winch was hydraulically powered, it 

 was possible to maintain a steady pull under fully stalled 

 conditions for a short period of time. These tests were con- 

 ducted in fair weather with dry equipment. Tests of the type 

 described in (3) were not run^, due to lack of sufficiently 

 sensitive pressure gauges. 



For the tests of the towed system , the depressor was 

 placed overboard and launched on a short scope of cable at 

 a ship's speed of three knots. Approximately 100 feet of 

 cable was payed out and the towing characteristics observed 

 at speeds of three, six, and eight knots. The cable scope 

 was then increased^ while at a speed of eight knots ^ and the 

 depth of the depressor monitored continuously during the 

 lowering. The pressure signal was lost^, however, at an 

 indicated depth of 420 feet. The lowering was continued 

 until 700 feet of cable was in the water. The ship's speed 

 was then decreased to six knots and the tensicaneter attached 

 to the towline. When the speed was decreased, the pressure 

 signal was regained. 



The tow was continued at six knots. Depth and tension 

 indications were recorded and the angle of the tow cable at 



11.10 



