292 STAFF COMMANDER EVANS AND MR. A. SMITH ON THE MAGNETIC 
Table I. — Iron-plated, Iron-built Ships. 
Compass. 
Approximate coefficients. 
A 
B 
c 
D 
E 
51 
S3 
e 
$ 
• e 
1 " r 
p 
piiec 
Standard. 
Greenhithe . . 
Sept. 16, 17, 1861 
+1 7 
-24 15 
- 7 42 
+ 9 23 
0 1 
+0 39 
+•019 
-•449 
-124 
+•164 
+•010 
« 
19, 
Portsmouth. . 
Oct. 15, 17, 1861 
-1 0 
-22 12 
- 5 52 
+ 8 56 
+0 44 
-•017 
-•409 
-•092 
+ •155 
+•013 
in 
19 
Gibraltar ...Feb. 1862 
-IS 51 
— 6 0 
+ 8 20 
+0 23 
- -2 93 
-•095 
+ -I 45 
+•006 
s 
■9 
Portsmouth... July 28, 29, 1862 
-0 12 
-17 24 
- 7 9 
+ 8 27 
+ 1 8 
-•003 
-•321 
-•114 
+•148 
+•020 
■Ml 
19 
Gibraltar ...Nov. 1862 
+ 1 0 
-14 39 
- 4 5° 
+ 8 25 
-0 43 
+•017 
—•272 
-•077 
+•146 
—•012 
± 
P 
■9 
f Heeled 7 -J 0 to Fort 
+0 50 
1 4 43 
+ 6 45 
+ 8 9 
+° 59 
+•015 
-•272 
+•108 
+•*43 
+•017 
hi 
If 
in 
Lisbon -I Upright, Jan. 1863 ... 
+0 50 
— H 33 
- 3 34 
+ 7 48 
—0 24 
+•015 
—•269 
-■057 
+•136 
-•007 
■" 
*6 
P 
t Heeled 7 I ,- 0 to Starboard 
+0 44 
-15 36 
-13 37 
+ 8 17 
-0 45 
+•013 
-•287 
—•216 
+ -I 45 
-•013 
* V 
Devonport ...May 1, 1863 
-0 12 
-17 10 
- 8 18 
+ 8 26 
-0 32 
-•003 
-•317 
-132 
+•146 
-■009 
r 
203 
Madeira Bee. 28 , 30 , 1863 
-1 59 
— 12 56 
— 2 48 
+ 7 15 
-0 4 
-'°35 
-•239 
— •046 
+■126 
—• 001 : 
191 
Plymouth ...June 1864 
+0 25 
-16 45 
- 3 24 
+ 8 44 
-0 19 
+■007 
-•311 
-•054 
+152 
-•005 
r 
190 
Portland 
Oct. 28, 1864 
-0 17 
-16 35 
- 4 33 
+ 8 45 
-0 41 
-•005 
-•307 
-•072 
+•152 
-■012 
1® 
193 
Starboard 
Greenhithe ...Sept. 16, 17, 1861 
+0 20 
-20 19 
- 7 35 
+ 15 28 
-0 7 
+•006 
-•395 
-111 
+•268 
-•002 
f 
195; 
steering. 
Portsmouth... Oct. 15, 17, 1861 
+0 12 
-20 37 
- 6 37 
+15 51 
-0 11 
+■003 
-•402 
-•098 
+■273 
-•003 
Ml 
193j 
Portsmouth... July 28, 1862 
-1 48 
-15 31 
- 7 50 
+ 11 56 
+0 43 
-031 
-•296 
-•121 
+•208 
+•012 
Jin 
202 
Devonport ...May 1, 1863 
-0 7 
-16 28 
-10 24 
+ 12 3 
-0 31 
-•002 
-•312 
-•160 
+•210 
-•009 
js 
20/ 
Main deck. 
Greenhithe ...Sept. 11, 1861 
-0 30 
-25 56. 
-12 6 
+10 58 
-1 15 
1 [ 
Greenhithe ...Sept. 16, 17, 1861 
+0 55 
-22 34 
- 7 49 
+ 11 43 
-1 46 
Standard. 
Greenock 1 ... 
Nov. 1861 
+0 10 
+23 0 
+ 3 41 
+ 8 19 
+0 25 
+•003 
+•422 
+•058 
+•145 
+• 00 ; 
8 
Portsmouth... Sept. 2, 1862 
+0 49 
+20 59 
+ 4 40 
+ 7 38 
0 0 
+ 014 
+•383 
+•074 
+•134 
• 00 ( 
u 
11 
f Heeled to Port 
+° 57 
+15 3 1 
+ 9 11 
+ 6 45 
+1 50 
+•016 
+ '282 
+•148 
+•117 
+•035 
*?{ 
Lisbon \ Upright, Jan. 1863 ... 
—0 1 
+15 39 
+ 3 12 
+ 7 24 
— I 20 
•000 
+•288 
+•052 
+•129 
— • 02 '; 
h 
ioj 
y Heeled 6 £° to Starboard 
+0 1 
+ 15 14 
— 2 6 
+ 7 14 
-I 25 
•000 
+•280 
-•034 
+•126 
— • 021 ! 
353 
Portland 
J une and July 1863 
+0 2 
+21 8 
+ 4 10 
+ 7 6 
+0 51 
•000 
+•384 
+•067 
+•124 
+•011 
lj» 
10 
Madeira 
Jan. 1864 
-0 25 
+ 13 12 
+ 4 29 
+ 7 *9 
—0 6 
—•007 
+•243 
+•072 
+•128 
-■00 
» 
.0} 
Lisbon 
Jan. and Feb. 1864 
+0 2 
+ i S 8 
+ 3 59 
+ 7 20 
—0 38 
•000 
+•278 
+•064 
+•128 
— •oil, 
i] 
Portland Mar. and Apr. 1864 
+ 1 22 
+21 16 
+ 5 24 
+ 7 54 
-0 24 
+•024 
+•389 
+•086 
+•137 
-• 00 ; 
; |P 
12} 
Portland 
Oct. 1864 
+0 30 
+ 19 5 
+ 35 
+ 7 2 
-0 3 
+•009 
+•349 
+ 050 
+•122 
-• 00 ; 
a j 
Starboard 
Portsmouth. . . 
Sept. 2, 1862 
+2 59 
+20 9 
+ 8 10 
+ 10 32 
+ 1 37 
+ 052 
+•379 
+•136 
+■184 
+•02! 
k nr 
steering. 
Plymouth . . . 
Nov. 1864 
+2 19 
+ 19 40 
+ 6 13 
+ 8 18 
+ 1 45 
+•010 
+ •363 
+•103 
+•144 
+-03( 
p 
IS 
Main deck. 
Portsmouth...! 
Sept. 2, 1863 
— ! 9 
+27 25 
+ 84 
+ 13 16 
+0 2 
-•020 
+•516 
+•120 
+•231 
•001 
1- 
:« | 
13 
Exact coefficients. 
.((iisimsk 
ffeilw 
\0^r 
Warrior. 
(6109 tons), 
Iron-plated, 
iron hull, 
40 guns, 
1250 horse-power. 
Built at Blackwall 
River Thames ; 
head N. 3° E. 
magnetic. 
Launched 
Dec. 29, 1860. 
Plated with head 
generally to N.W. 
Black Prince. 
(6109 tons), 
Iron-plated, 
iron hull, 
41 guns, 
1250 horse-power. 
Built at Glasgow ; 
head S. 20’ E. 
magnetic. 
Launched 
Feb. 27, 1861. 
Plated head South. 
1 X observed at Greenock =-804, multiplied by earth’s horizontal force '89='716. 
“‘tatoj'oi 
