ADDENDUM C-5 



Detector Position Indicator 



The device shown in Fig. G-12 which is used to indicate the position 

 of the detector housing, is located within the watertight detector housing 

 and functions as a weighted pendulum. The pendulum is connected directly 

 to a 3-turn 5000-ohm potentiometer by a small pinion gear. This potenti- 

 ometer is connected to an identical potentiometer on board the vessel. 

 The readout is shown in the following sketch: 



12-V dc 



With the detector housing in the vertical position the ammeter, A, is 

 zeroed with the potentiometer, P2. As the pendulum moves, it changes 

 the potentiometer, T 1} which causes the ammeter pointer to move to the 

 right or left. This ammeter is calibrated in degrees and reflects the 

 position of the detector housing. 



C-31 



