THEORY OP ADJUSTMENT 



23 



rected independently. Further, it is apparent that the best method 

 of adjustment is to use (1) permanent magnet correctors to create 

 equal and opposite vectors of permanent magnetic fields at the com- 

 pass, and (2) soft iron correctors to assume induced magnetism, the 

 effect of which will be equal and opposite to the induced effects of 

 the ship for all magnetic latitude and heading conditions. The 

 compass hinnacle provides for the support of the compass and such 

 correctors. Study of the binnacle in figure 18 will reveal that such 

 correctors are present in the form of : 



(1) Vertical permanent heeling magnet in the central vertical 

 tube, 



DEGAUSSING C0MFSieAn?«5 

 OOIIS 



FORS»A?iD-iIT »fi*» 

 MMJKST TRAIS 



Figure 18. — Binnacle with compass and correctors. 



