Within the instrument house signal 

 cables are connected to 98 terminals 

 on patch panels. This bundle of signal 

 cables leads through conduit to re- 

 corders in the various rooms. 



Protective bell-shaped clamp starts 

 power cable up tower leg (A) through 

 strong permanent clamps (B). The 

 instruments are grounded by another 

 cable which leads to a large copper 

 plate buried in the sand near the 

 tower. Signal cables require chang- 

 ing as sensors are installed, re- 

 moved, and repaired. They are 

 encased in old fire hose to avoid 

 abrasion against the tower by the 

 surging water. They are then 

 clamped with single-channel brack- 

 ets (C) held out from the tower leg. 

 These brackets have been modified 

 to allow additional cables of any 

 size to be attached underwater. 

 Rubber bands made of surgical 

 tubing hold the cables in place. 



Underwater signal cables may become tangled by 

 water motion unless they are carefully attached to a 

 fixed support by clamps or brackets. 



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