70 
MR. AIRY ON THE OBSERVED DEVIATIONS OF THE COMPASS 
No 
17. 
18. 
19. 
£0. 
Ship’s name 
Maeander. 
Virago. 
Plumper. 
Place of observation 
Simon’s Bay. 
Plymouth. 
Valparaiso. 
Portsmouth. 
Time of observation 
1853, March. 
1851, September. 
185£, September. 
1853, September. 
Index correction 
+ 0° £3' 
— 0° 19' 
4-0^ 9' 
4-0° £7' 
Approximate modulus 
•044 
•1£9 
•012 
•106 
Approx, starboard angle ... 
15‘’-80 
0'’-58 
6‘‘-£5 
0'’-90 
Observed 
deviation 
uncor- 
rected. 
Residual 
error. 
Observed 
deviation 
un cor- 
rected. 
Residual 
error. 
Observed 
deviation 
uncor- 
rected. 
Residual 
error. 
Observed 
deviation 
un cor- 
rected. 
Residual 
error. 
Apparent azimuth of ship’s head. 
P 
r 0 
1 
£ 
3 
4 
5 
6 
7 
8 
9 
10 
11 
1£ 
13 
14 
15 
16 
17 
18 
19 
£0 
£1 
££ 
£3 
£4 
£5 
£6 
£7 
£8 
£9 
30 
[_ 31 
O ! 
-1 0 
-1 0 
— 1 0 
-1 10 
— £ 40 
— £ 40 
— 3 1£ 
— £ 40 
( — £ 55) 
— 3 10 
-£ 55 
— £ £5 
-£ 10 
— 1 50 
-1 0 
— 0 10 
— 0 50 
0 0 
+ 0 50 
+ 1 0 
+ 0 50 
+ 1 £0 
+ 1 50 
+ £ 0- 
+ £ 0 
+ £ 40 
+ 1 40 
+ 1 57 
+ 1 50 
+ 1 £0 
+ 1 10 
0 0 
(-6 4.3) 
— 0 13 
+ 0 16 
+ 0 3£ 
-0 34 
— 0 15 
-0 3£ 
+ 0 10 
(-0 1) 
-0 18 
-0 11 
+ 0 7 
+ 0 4 
+ 0 £ 
+ 0 £6 
+ 0 48 
(-0 £1) 
-0 1 
+ 0 £0 
+ 0 4 
-0 30 
-0 19 
-0 4 
— 0 4 
(-0 8) 
+ 0 34 
-0 18 
+ 0 11 
+ 0 ££ 
+ 0 14 
+ 0 30 
-0 1£ 
+ 1 6 
+ £ 50 
-f 4 0 
-+5 0 
+ 6 30 
+ 8 0 
+ 9 40 
+ 9 40 
4-8 40 
+ 7 20 
+ 6 40 
+ 4 30 
+ 3 0 
+ £ 0 
+ 1 0 
-fO 40 
-0 50 
-1 £0 
-£ £0 
— 3 0 
— 3 35 
-5 £0 
-6 30 
-7 10 
— 8 £0 
— 8 £0 
-7 40 
— 6 £0 
-6 0 
-3 £0 
-0 50 
+ 0 40 
(-6 10) 
-f-O 15 
-f 0 5 
-0 7 
4-0 £3 
4-1 5 
4-2 13 
4-1 58 
(-fO 59) 
-0 3 
-0 8 
-1 29 
-1 57 
— 1 43 
— 1 ££ 
-0 17 
(-0 18) 
+ 0 37 
+ 0 57 
4-1 29 
4-1 54 
4-0 57 
+ 0 19 
-0 6 
(-1 17) 
-1 35 
— 1 30 
-0 59 
— 1 41 
— 0 15 
4-0 54 
4-0 59 
o / 
-f 1 0 
4-1 40 
4-£ £0 
-|-£ £0 
4-2 20 
-|-£ 30 
-|-£ £0 
4-0 £0 
-0 30 
-1 0 
— 1 £0 
— £ 0 
— £ 10 
-£ 40 
-£ 40 
— 1 £0 
-0 10 
-0 10 
0 0 
4-0 50 
4-0 50 
-1 30 
4-0 50 
4-0 £0 
-0 £0 
-1 0 
-1 0 
— 1 30 
— 1 0 
-1 0 
— 1 0 
-0 10 
(4-0 31) 
+ l 9 
4-1 49 
4-1 50 
4-1 5£ 
-|-£ 6 
4-2 1 
4-0 8 
(-0 35) 
— 0 57 
-1 9 
— r 4£ 
— 1 43 
-£ 7 
-£ 1 
-0 37 
(4-0 37) 
4-0 39 
+ 0 49 
4-1 38 
4-1 36 
-0 48 
-fi 27 
4-0 50 
( + 0 3) 
-0 45 
-0 53 
-1 30 
-1 9 
— 1 15 
— 1 £1 
— 0 35 
4-0 35 
4-£ 20 
4-3 40 
4-5 0 
4" 5 55 
4-6 45 
4-6 35 
+ 6 0 
+ 5 45 
4-4 40 
4-3 45 
+ £ 50 
( + 1 45) 
(4-0 40) 
(-0 £5) 
— 1 30 
-1 45 
— 1 50 
— £ 40 
-3 40 
— 4 £5 
— 4 35 
— 4 55 
— 5 35 
— 6 15 
-6 35 
-6 £5 
-6 0 
—5 30 
(-4 £0) 
— 3 10 
-1 5 
(-6 £) 
4-0 33 
4-0 50 
4-1 14 
4-1 £3 
4-1 38 
+ 1 5 
4-0 £3 
(4-0 13) 
— 0 33 
-0 56 
-1 6 
-1 17 
-1 £0 
-1 17 
-1 11 
(-0 16) 
+ 0 49 
4-1 £ 
4-0 58 
4-0 59 
4-1 24 
4-1 27 
4-0 54 
(■fO 9) 
-0 30 
— 0 5£ 
— 1 1£ 
— 1 36 
— 1 £8 
— 1 £6 
-0 3£ 
Qiiadrantal coefficients 
o / 
-0 9 
+ 0 10 
-0 9 
+ 0 14 
o / 
4-1 10 
— 1 £4 
+ 1 13 
-0 49 
-|-£ 11 
-£ 3 
4-1 14 
— 1 30 
4-1 £5 
— 1 3£ 
4-1 31 
— 1 31 
xMean quadrantal coefficient 
-0 11 
+ 1 9 
4-1 44 
4-1 30 
T rue modulus 
•044 
•130 
•01£ 
•106 
True starboard angle 
' 15P-80 
0'’-56 
e^-is 
0'’-87 
