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CONTROL AND SIGNAL BUILDING 



2835 



In use the apparatus must be attached far enough up the anchor cable so that it 

 will not touch the bottom nor the anchor. The cone-shaped clamp is attached to the 

 lower end of the stainless steel wire rope and the detachuig housmg is locked in place 

 around it. To the lower end of the housing is attached the upper end of the anchor 

 chain. 



Before using the apparatus to detach the anchor, the anchor should be raised a 

 few fathoms off the bottom in order to remove all slack from the anchor cable. With 

 the anchor cable held taut, the messenger is secured about it and released. As the 

 messenger passes over the releasing housing it strikes the trigger pin, and removes it 

 entirely ; the fingers are released and the weight of the anchor makes them spring apart 

 and fall away from the anchor wire. Thus the releasing housing, messenger, and heavy 

 chain and anchor are left on the bottom, while the anchor wire is hoisted aboard with 

 only the clamp attached. 



2835. Methods of Attaching Anchor Cable 



There are a number of general precautions to be taken when buoys are anchored 

 in exposed areas with a single anchor cable and are thus free to swing about their 

 anchors with changes in wind and current. Swivels are usually used as connections in 

 the anchor cable to avoid snarls in the chain and kinks in the wire rope, A %-inch 

 galvanized drop-forged swivel or swivel shackle is satisfactory and one should be used 

 at each end of the main anchor cable and at one end of any short section in which twists 

 may occur, such as between the sono-radio buoy and the relieving buoy. 



Screw-pin anchor shackles are used to join sections of anchor cable and elsewhere 

 where swivels are not needed. For the more permanent connections %-inch shackles 

 are used, but a %-inch size is reconunended for any connection which must be quickly 

 shackled or unshackled when the buoy is being anchored or hoisted aboard, because 



B 



Figure 47.— Arrangements of buoy anchor cables. 



