INDEX 



(The iiuiii1km-s rplVi- to fiilidcs) 



A 



A coefficient— 28, 38, 81, figure 19. 



"A" type ceo control box— 119, 130, figure 41. ■ 



Adjustment, magnetic : 



Definition — Introduction, 15. 



Purpose— 15, 31, 33, 36. 



When necessary — 90. 



Principles— 31, 32, 34, 76. 



Correctoi's used — 31, 32. 



Expected errors— 81, 82, 103. 



Procedure— 76, 77, 83, 84, 34, 35, 1, 2. 91. 



Check-off list— 1, 2, 3. 



Simplified method — 2, 3. 



Analysis method — 87, 88. 



One-swing method — 87, 88. 



Mechanics of — Figure 1, figure 19. 



Precautions— 1, 2, 37, 86. 



On compass headings — 47. 



On magnetic headings — 47. 



Residual deviations — 2, 89, 90. 



Data and records— 2, 89, 90. 

 Air core compensating coils — 116, 117. 

 Alignment, lubber's line : 



Compass, gyro, pelorus — 1, 75. 



Magnet trays, magnets — 1, 102. 

 Analysis of deviation curve — 38, 39, 40. 

 Annealing, sphere or Flinders bar — 74 

 Annual change, variation — 9, 44. 

 Apparent time, local — 63, 64, 65, 70, 

 Approximate coefficients — 38, 40. 

 Azimuth circle — 49, 53. 

 Azimuth of sun : 



Definition— 57, 58. 



Use of— 58, 49, 51, 53. 



True— 57, 59. 



Magnetic — 57, 59. 



Relative— 59. 



Calculation— 66, 67, 68. 



Sample calculation — 68. 



Curve or table — 65, 70. 

 Azimuth tables : 



H. O. 71 and H. O. 214—59, 67, 69 



Arguments— 67, 68, 69. 



Use of— 66. 



143 



