370 
ME. EVANS ON THE DEYLITION OE THE COMPASS 
Table I. — Iron-built Ships, Her Vlajesty’s {crjntinued). 
Date. 
Place of observation. 
Ship’s name and Tonnage. 
Permanent coefficients. | 
1 
Coefficient 
E. 
Ship's 
force to 
Head. 
Earth’s 
horizontal 
force 
=1-000. 
j 
Coefficient 
C. 
Ship’s 
force to 
Staihoard. 
Earth’s 
horizontal 
force 
= lvX'. 
A. 
D. 
E. 
1 
May 25, 1857. 
Sheerness 
Brl'ne, 267 
-0 35 
+0 22 
+0 56 
- 9 15 
-01607 
7 - 3 28 
0-0605 
Aiy. 7 , 1849 . 
Penetanc/uishine, 
Mohawk, 228 
— I 28 
+3 I 
-1 47 
+ 10 15 
o*i ''79 
- 8 5 
— 0-1406 
Lake Huron, Canada. 
1846 
Torch, 343 
-0 26 
+2 56 
+0 5 
+ 11 8 
01931 
- 4 3 
-0 07'.>6 
May 10,1852. 
1 
-0 4 
+2 43 
+0 24 
+ 10 41 
0T854 
- 0 46 
-0+134 
f 
4-3 2 
+2 52 
-0 5 
+ 6 25 
0*1117 
- 0 -C 233 
\Jidy 6 , 1852 . 
Madeira 
J 
1 
+2 48 
+2 10 
-0 43 
+ 6 52 
o’l 196 
“ 0 57 
— C-C 166 
July 22 , 1852 . 
8t. Vincent, 
— I 40 
+2 46 
— 0 52 
+ 74 
0-1230 
— I 10 
— o*czc 4 
Cafe de Verd Islands. 
— 0 7 
-(-2 29 
+0 9 
+ 7 17 
0-1268 
— I 6 
— 0*0192 
-j-O 12 
+ - 23 
— 0 56 
+ 7 4- 
0*1340 
- 3 13 
— 0-0561 
Dec. 10 , 1852 . 
Cafe of Good Hofe 

— I 17 
+ i 57 
+0 6 
+ 9 18 
0-1616 
+ 0 30 
0-0087 
Jan. 26 , 1853 . 
8t. Paul's Island, 
+ I 58 
+ i 39 
-f-o 6 
+10 17 
o’i-S 5 
- 0 28 
— o-cc8 1 
Indian Ocean. 
Feh. 18 , 1853 . 
Bvociu jRiveT^ AitstTalici... 
— I 5 
d-i 31 
-0 15 
+ 6 58 
0*1213 
- 0 13 
— 0 -CC 3 S 
Mar. 15 , 1853 . 
King George's 8ound . . . 
— 2 8 
+2 44 
+0 44 
+ 841 
0*1510 
- 1 13 
— C*C212 
July 1856 . 
East Coast, Austrcdia . . . 
+0 25 
+ i 37 
— 0 II 
+ 8 iS 
0-1443 
+ 0 23 
c-cc6- 
May 11, 1844. 
Hover, 224 
+ 1 14 
+2 38 
+0 s 
— 6 57 
- 0-1210 
- 4 10 
-0-0727 
Sept. 25, 1849. 
Plymouth 
+0 2 
+2 23 
-0 18 
— 4 58 
-0-0866 
+ 0 25 
0-0073 
WiLBERFORCB, 457 
+0 33 
+2 18 
+0 15 
— 7 4S 
-01357 
- 7 15 
-0-1262 
Jidy 5 . 1843 . 
River Gambia 
0 0 
+2 6 
+0 7 
- 4 39 
— o-oSii 
- 4 12 
— 0*0732 
.Jan. 1.8, 1844 
Greenhithe 
Dwarf, 164 
-0 35 
+2 2 
+0 17 
+13 5 
0-2264 
— 3 8 
i 
- 0-0547 
Table II. — Floating Batteries*, Her iSIajesty’s Xa^T. 
July 1857. 
Sheerness 
Terror, 
1971 
-1 45 
+6 17 
- 
-0 44 +25 12 ; 0-4-258 j +2 3 0-0358 
■1 
July 5, 1855. 
Greenhithe 
Meteor 
-1 19 
+0 12 
0 0 j - 1 19 -0 0230 1 -3 31 j-0 0613' 
Mar. 31, 1856. 
Sheerness 
Thuniier, 
1469 
+0 34 
-0 40 
+0 9 1 -11 33 -0-20021 -1 33 i -0-0270 
; 1 
Mar. 26, 1856. 
Sheerness 
Tuusty, 
1539 
+0 4 
+ 1 37 
-1 54 -16 55 -0-2910 j +3 52 i 0-0674 
' 1 1 i 
* Of tliese. Teuuou is tlie only Iron-hdlt vessel ; the others are Wood-bidlt plated with iron. 
