COMPASS IN IRON ARMOUR-PLATED, IRON, AND COMPOSITE SHIPS. 629 
Table I.—Values of the Constant Parameters P and c, Q and f at Standard 
Compass Positions in Her Majesty’s Ships (continued). 
Geographical 
Date of 
Original 
Corrected 
c 
v tan 6 
Original 
Corrected 
f 
\ tan 9 
f 
position. 
observation. 
P. 
P. 
in England. 
Q. 
Q. 
in England. 
J * 
Iron slu 
ps case 
I ivitll UK 
)od (co 
ntinued] 
Inconstant.— 
Built S. 38° W. Distance of standard fr 
om stern 79 feet, 
from iron 
mast 13 feet. 
Spithead . . . 
19 
viii. 69 
+ •297 
+ •107 1 
+ •039 
-•124 
20 
viii. 69 
-•023 
+ 6° 10' / 
+ •016 
Plymouth . 
21 
viii. 70 
-•071 
+ •020 
Spitkead . . . 
18 
xi. 71 
-•044 
+ •017 
Rio de Janeiro . 
9 
i. 72 
-•044 
-•015 
Spithead . . 
12 
x. 80 
+ •238 
+ +10 
14 
x. 80 
-■094* 
-•005* 
Melbourne . . 
vii. 81 
-•150 
+ •031 
Simonoseki . 
15 
xi. 81 
-•150 
-•041 
Simon’s Ray, C. 
Good Hope. . 
v. 82 
-•131 
-•020 
Iron 
troopships. 
Euphrates.—B uilt N. 67° W. Distance of 
standard fi 
om stern 96 feet, 
from iron 
mast 33f feet. 
Birkenhead . . 
16 
v. 67 
-•239 
+ •079 | 
+ •027 
-■267 
JJ 
18 
v. 67 
-•226 
4° 30' / 
+ -019 
Spithead . . 
18 
vi. 67 
-•172 
+ •004 
Simon’s Bay, C. 
Good Hope . . 
31 
vii. 67 
— T59 
+ •092 
Suez .... 
10 
i. 68 
-156 
+ •097 
Spithead . . . 
11 
x. 71 
-•245 
-•089 
Himalaya. —Built . . 
standard from stern 64 feet. 
Spithead . . . 
8 
iii. 67 
-•077 
+ •017 1 
+ •007 
+ •270 
+ •015 } 
+ •006 
5) ... 
15 
iii. 67 
-■048 
+ 1° 0' / 
+ •035 
+ 0° 52'/ 
Plymouth . . 
2 
vii. 72 
-•030 
-•061 
Simon’s Bay, C. 
Good Hope . 
viii. 72 
-■030 
-•042 
Plymouth . \ . 
9 
xi. 74 
-•021 
+ •015 j 
+ •006 
-•058 
Simon’s Bay, C. 
= l 
( 
Good Hope . 
18 
i. 75 
-•021 
+ 0° 52'J 
-•081 
Plymouth. . . 
18 
vi. 75 
-•031 
-•081 
Orontes.—B uilt 
N. 68° W. Distance of standard from stern 66 feet, from iron 
mast 9 feet. 
Birkenhead . . 
26 
i. 76 
-•084 
+ •074 j 
+ •029 
-•202 
Spithead . . . 
2 
iii. 76 
-•042 
+ 4° 15' J 
+ •018 
}> ... 
5 
' ix. 79 
-•058 
+ •084 
Simon’s Bay, C. 
Good Hope . 
x. 79 
-•058 
+ •034 
Mauritius . 
xi. 79 
-•044 
+ •094 
mdccclxxxiii. 
* After re-correction by a permanent magnet. 
4 M 
