THERMISTOR 

 BEAD ON 

 30-FOOT PIPE 



The topside unit of the Towercom consists of speaker, 

 amplifier, and associated electronics. The unit is 

 placed near the temperature-recording system in the 

 tower so the engineer may observe the behavior of the 

 sensors being repaired and communicate instructions to 

 the divers. 



When leaks develop at a thermistor station, divers 

 descend, disconnect the faulty sensor, repair or replace 

 it, and check for proper operation with an engineer 

 monitoring both the temperature sensing and Towercom 

 system. Communication is facilitated by plugging the 

 divers' leads into the electrical system of the array. 

 Divers can use either scuba or hookah with Towercom 

 equipment. 



SEA FLOOR 



7 



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131 



