4 HANDBOOK OF MAGNETIC COMPASS 



spheres or Flinder bar, realign binnacle, move gyro repeater if it is 

 affecting the compass, or to make any other necessary preliminary 

 repairs. It is further stressed that expeditious compass adjustment 

 is dependent upon the application of the various correctors in a logical 

 sequence so as to achieve the final adjustment with a minimum number 

 of steps. This sequence is incorporated in the above check-off list and 

 better results will be obtained if it is adhered to closely. Figure 

 19 presents the various compass errors and their correction in con- 

 densed form, and the table in figure 1 will further clarify the me- 

 chanics of placing the corrector magnets, spheres, and Flinders bar. 

 Chapter VII discusses the more efficient and scientific methods of 

 adjusting compasses, in addition to a more . elaborate treatment of 

 the items mentioned in the check-o-ff list. Frequent, careful observa- 

 tions should be made to determine the constancy of deviations, and 

 results should be systematically recorded. Significant changes in 

 deviation will indicate the need for readjustment. 



