124 



HANDBOOK OF MAGNETIC COMPASS 



142. Slioiild both c and / exist on a ship, the angular position for a 

 Flinders bar to correct the resultant vertical induction effects may 

 be found by : 



tan i3=- or 

 c 



/S is the angle to slew the Flinders bar fi-om the fore-and-aft axis. 

 If c and / are negative, the bar will be slewed clockwise from the 

 forward position ; if c is negative and / is positive, the bar will be 

 slewed counterclockwise from the forward position; and if c is 

 positive and / is negative, the bar should be slewed counterclockwise 

 from the aft position. 



After so determining the angle to slew the Flinders bar from the 

 fore-and-aft line, the total amount of Flinders bar necessary to correct 

 the resultant vertical induction effects in this position is f ouiid by : 



The constant r is then used on the c or / constant curve in figure 34 (b) 

 to determine the total amount of Flinders bar necessary in the slewed 

 position. 



