146 HANDBOOK OF MAGNETIC COMPASS 



Deviation — Continued. 



Methods of determining — 53-56. 



Records— 3, 89, 109, 126, 132. 



Analysis of— 38-40. 



Correction— 31, 113, figure 19. 



Constancy— 103-106. 



Residual curves— 3, 89, 109, 126, 132. 



On compass headings or magnetic headings — 41, 42. 

 Dip needle— 133, 135. 

 Dip, magnetic, angle of — 8. 

 Directive force — 19. 



E 

 E coefficient— 25-27, 38, 81, figure 19. 

 Earth's magnetic field — 1, 8. 

 Equation of time— 60. 

 Errors on compass — 15, 46, 102, 112. 

 Exact coefficients — 40. 



F 



Flashing— 106. 



Flinders bar : 



Purpose — 77, 81. I 



Methods of determining length — 77, 96. 



How placed — 77, 78, 95. 



Necessary data for calculations — 77, 95, 96. 



Calculation— 96. 



Estimation — 96. 



Formula — 96. 



Correction chart — Figure 34. 



Problem — Appendix C and D. 



Procedure after installing — 98, appendix C and D. 



Slewing— 141, 142. 



Magnetization check — 74. 



Annealing — 74. 



T) error from — 93. 



B magnet induction in— 98. 



Heeling magnet induction in — 98, 100. 



Heeling coil induction in — 123. 



(B) coil— 115, 116. 

 Frozen compasses— 35. 



G 

 "G" type compensating coils — 116, 108 (3) 

 Gaussing error — 105. 

 Greenwich Civil Time — 63. 

 Gyro— 48, 75. 



H 

 H (heeling) coil— figures 39-43 inclusive, 108, 115, 116, 128, 117, 129 

 Heading of ship : 



Definition — 43. 



Types— 43. 



Methods of obtaining— 48, 49, 50, 51, 52. 



Adjusting on — 47 



Relationships — 46. 



