TIsaacs—Faughn—-Schick—Sargent: Deep-Sea Moorings 289 
displacement of the system caused by an anchor gradually sliding down to a local 
low is negligible. On extensive steep slopes it is difficult to anchor a mooring at a 
selected depth, and such sites are doubly undesirable. 
FIrtTINGs 
The galvanized wire rope used between mooring wire and anchor and between 
mooring wire and submerged float usually terminates in a large galvanized thimble 
secured with Nicopress fittings. Nylon rope usually terminates in a round plastic 
thimble and a hand splice which permits the thimble to rotate without damage to 
the eye when under tension. A special wire terminal clamp (fig. 9) has been de- 
O7 (Wa-T) cos 
Wa 
Fig. 8. Forces on anchor on sloping bottom. 
signed for securing the piano wire to a shackle. In use it is advisable to insulate the 
clamp from the shackle by a micarta sleeve and washers and to paint the clamp 
with plumbers’ black mastic just after it is in place. 
BoTTOM-DETECTING DEVICES 
The anchor is provided with a 150-foot pennant carrying a device that will give 
warning when it touches the bottom. The bottom-detecting device, on contact with 
the bottom, allows a solid steel piston, weighing about 30 pounds and fitted with 
a sharp fluted point, to fall and puncture a small glass ball (3 inches in diameter) 
