CHAPTER XIII. COMPASS COMPENSATING COIL 



EFFECTS 



131. Figures 56 to 60 are presented as useful information to compass 

 coil compensators. The curves indicate the amount of correction 

 which can be expected from different types of compass coils, under 

 various conditions of load and iron core mounting. Familiarity with 

 these curves will enable the compensator to : 



(1) Anticipate the ability of certain coils to provide the neces- 

 sarv correction. 



0.2S- O.S 



HMD O/V CO/L 



ri^P£ 'B" FL//i/D£/iS Bfl/?(S)CO/L 



Figure 56. 



(2) Anticipate changes in coil correction resulting from chang- 

 ing Flinders bar length or sphere positions. 



(3) Detect wiring difficulties more readily by knowing the 

 approximate voltage necessary for certain corrections. 



(4) Appreciate sensitivity of coil adjustments when working 

 on steep-sloped curves. 



(5) Shift coils when necessary to correct many effects with a 

 minimum installation. 



107 



