COMPENSATION WIRING 



C. Wiring 



91 



118. Schematic wiring. — The elementary wiring diagram for any 

 three-circuit degaussing compensation coil installation is arranged as 

 shown in figure 45, whether for types "B," "G," "K," or "T" coils. 



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FiGUEB 45. — Elementary wiring of compass coil circuit. 



119. Control box wiring. — The internal wiring of the Type "A" 

 compass compensating coil control box is illustrated in figure 46. 



Adjustment of current to any compensating coil through this type 

 "A" control box is as follows: 



(1) First, set slide wire resistor in approximately midposition. 



(2) Then, roughly obtain the desired current by shorting out 

 sufficient series resistance in the appropriate circuit, by the use of 

 resistor taps on the terminal strip. (It is always better to leave 

 a Tnaximum amov/nt of resistance in the circuity if possible.) 



(3) Finally, the current adjustments may be refined by further 

 manipulation of the slide wire resistor. 



120. Interconnection wiring. — A typical interconnection wiring 

 arrangement for a type "B" compass coil installation is illustrated in 

 figure 47. A typical interconnection wiring arrangement for a type 

 "G" compass coil installation is illustrated in figure 48, A typical 

 interconnection wiring arrangement for a type "K" compass coil in- 

 stallation is illustrated in figure 49. A typical interconnection wiring 



