218 REPORT ON 



After Binnacle Compass. 



o = + 0.8029 4- 14.000 A x — 8.825 B x 4-4.717 C x — 1. 631 D x — 1.090 E x 

 o = — 0.5291 — 8.825 A x 4- 7.545 B x — 0.816 C x 4- 0.934 D x 4- 4.272 E x 



= 4- 0.4497 4- 4.717 ^, — 0.816^ 4- 6.456 c x — 4.554 A + 3-784 A 



o = _ 0.0385 + A + i (A 2 - C*) 



= 4- 0.0018 4- E x 4- B x C x 4- 0.0047 (A 2 — c i) 



Hence 



Hence 



Hence 



Hence 



A x = — 0.0208 ==■ — i° 11'. 4 

 B x = + 0.0393 = + 2 I 5-° 

 C x = — 0.0222 = — 1 16.2 

 £> x = 4- 0.0380 = 4- 2 IO -5 

 E x = — 0.0010 = — o 3.3 



• 

 After Ritchie Compass. 



= + 0.0989 4- 14.000 A x — 8.825 B x 4-4.717 C x — 1. 631 D x — 1.090 E x 

 o = — 0.1171 — 8.825 A x 4- 7.545 B x — 0.816 C x 4- 0.934 D x 4- 4.272 E x 

 = 4- 0.2238 4- 4.717 A x — 0.816 B x + 6.456 C x — 4.554 D x 4- 3.784 E x 

 o = — 0.0340 4- D x + i (2?^ — C\ 2 ) 

 = 4- 0.0008 4- E x 4- B x C x 



A x = + 0.0627 = + 3° 35'-5 



^ = + 0.0778 = 4-4 27.3 



C, = — 0.0497 =— 2 51.0 



A — + 0.0322 = 4 1 50.7 



E x = 4" 0.0031 = -f- o 10.6 



Forward Alidade Compass. 



o = — 0.4683 4- 14.000 A x — 8.825 B x 4- 4-7 r 7 C x — 1. 631 D x — 1.090 E x 

 = 4- 0.4115 — 8.825 A x 4- 7.545 B x — 0.816 C x + 0.934 D x 4- 4.272 E x 

 = 4- 0.1082 4- 4.717 A x — 0.816 .#, 4- 6.456 Q — 4.554 A 4- 3.784.5', 

 o = — 0.0235 + A 4 \ (B x * — C*) 

 o = — 0.0007 -\- E x -\- B x C x -\- 0.0125 {B x — C x ~) 



A x = 4" 0.0200 = 4 l0 8'. 8 



B x = — ■ 0.0361 = — 2 4.1 



C, = — 0.0197 = — 1 7.6 



D x = 4- 0.0230 = 4 x J 9- 2 



.Z?! = 0.0000 = o 0.0 



Forward Binnacle Compass. 

 = 4- 0.3956 4- 14.000 A x — 8.825 B x 4-4.717 C x — 1. 631 D x — 1.090 E x 

 = 4- 0.0125 — 8.S25 A i + 7-545 B x — °- Sl6 c i + °-934 A 4- 4.272 E x 

 = + 0.7497 4- 4.717 A x — 0.816 B x 4- 6.456 C, — 4-554 A 4- 3-784 A 

 o = — 0.0369 4 D x 4- \ (B* — C, 2 ) 

 o = — 0.0011 -\- E x -\- B x C x 



A x = — 0.0298 = — i° 42'. 6 

 B x = — 0.0478 = — 2 44.3 

 ■C, = — 0.0719 =—4 7-3 

 A = 4" 0.0384 = 4 2 l:t -8 

 E x = — 0.0023 = — o 7.9 



