144 HANDBOOK OF MAGNETIC COMPASS 



B 



B coefficient— 17, 21, 38, 81, 97, figure 19. 



B (Flinders bar) coil— 115, 108! 



B magnet corrector — 31, 32, 81. 



"B" type compensating coils — 115. 108 (2). 



Binnacle — 31, figure 18, figure 43. 



Bubbles in compass — 1, 72. 



C 



C coefficient— 17, 38, 81, figure 19. ^ 



C magnet corrector — 31, 32, 81. 

 C (sphere) coil— 115, 108. 

 Check-off list procedure : 



Adjustment (magnetic) (chap. I) : 

 Dockside tests — 1. 

 DiOckside adjustments — 1. 

 Adjustments at sea — 2. 



Compensation (degaussing) (chap. IX) : 

 Dockside tests — 107. 

 Dockside compensation — 108. 



Final compensation — 109. ' 



Coefficients of deviation : 



Approximate— 38, 39, 40, figure 19. 



Exact— 40. 

 Coils : 



Compensating— 113, 114, 115, 116, 117. 

 Compass : 



Description — 4, 102. 



Design— 102. 



Liquid — 72. 



Location— 102, 104. 



Alinement — 75. 



Tests— 73. 



Error— 46, 102, 112. 



Deviation — 15, 45. 



Heading— 43, 46, 47, 53. . , 



Rose— 44. 



Adjustment. {See adjustment.) 



Compensation. {See compensation.) 



Operation — 33. 



Remote reading — 146. 

 Compass record book— 2, 89, 126, 132. 

 Compensation, degaussing : 



Definition — Introduction, 113. 



Purpose— 112, 113. 



When necessary — 127. 



Principles— 113, 114, 121-124. 



Coil correctors — 113, 114. 



Installation— 115, 116. 



Equipment— 115, 116, 117, 119. 



Control box— 119, 130, figure 41. 



Wiring of equipment— 118, 120, 121. 



