IN THE lEON SHIPS OP THE EOTAL NAVY, 
359 
due to displacement of sight- vanes, and prism, are also made at this observatory, the 
compass being afterwards supplied to Her Majesty’s ships perfectly free from error. 
No. II. 
Table of Magnetic Elements (Terrestrial). 
Place. 
From Magnetic Survey of the 
British Islands ; — 
Greenwich 
Greenhithe 
Sheerness 
Portsmouth 
Portland 
Plymouth 
Holyhead 
River Tagus 
Malta 
Corfu 
Athens 
Constantinople 
River Danube, St. George’s Mouth 
Madeira 
St. Vincent, Cape de Verd Islands 
River Gambia 
Isles de Los 
Fernando Po 
Ascension Island 
Tristan d’Acunha 
Cape of Good Hope 
St. Paul’s (Indian Ocean) 
Kurrachee 
Hong Kong 
Canton 
Shanghai 
Apia, Upolu I. (Pacific Ocean)... 
Sydney, New South Wales 
Port Nicholson, New Zealand ... 
iKing George’s Sound 
■Swan River, Australia 
jSydney, Cape Breton Island 
iSt. John’s, Newfoundland 
Halifax, Nova Scotia 
Penetanguishine, Lake Huron , . . 
Antigua 
Rio de Janeiro 
Monte Video 
Callao 
Valparaiso 
Sandwich Islands, Honolulu 
Vancouver Island, Esquimalt ... 
,, Naniamo 
Inclination, or Dip. 
Tear. 
Tear. 
1837 
4-69 
17 
1859 
+68 
25 
-469 
15 
>> 
4-69 
12 
11 
4-69 
2 
11 
4-69 
7 
11 
4-69 
16 
11 
4-70 
52 
1840a 
4-64 
0 
1858 
+60 
39/ 
11 
4-52 
0 
11 
4-55 
0 
1857 
+ 55 
42g 
11 
+51 
0 
1} 
+54 
0 
11 
+60 
0 
11 
+60 
30 
1847 
+59 
42 
11 
+ 45 
A 
+ 38 
30 
11 
+33 
30 
0 
0 
11 
+ 0 
30 
-43 
0 
-53 
20 
1857 
-54 
42 A 
-68 
0 
11 
+28 
15 
11 
+30 
20 
1858 
+31 
26 4 
11 
+31 
30 
1858 
+32 
35 A 
11 
+44 
0 
1857 
+45 
184 
-35 
30 
-62 
45 
1849 
-62 
45 
— 65 
0 
1850 
-64 
52 
— 65 
0 
1845 
— 65 
12 
-62 
30 
1846 
-63 
6 
11 
+76 
30 
11 
+76 
0 
11 
+75 
45 
1847 
+ 75 
37 
11 
+ 76 
0 
1844 
+76 
20 
11 
+50 
0 
-12 
30 
1857 
-11 
214 
-35 
0 
1853 
-32 
7i 
- 7 
0 
-38 
30 
1857 
-35 
374 
11 
+40 
30 
1857 
+42 
0 k 
11 
+72 
0 
1858 
+71 
55 k 
11 
+72 
20 
Total 
Intensity, 
in 1840. 
Arbitrary lArbitrary 
Beale. scale, 
b 
Scale 
adopted 
in 
Report. 
1-372 
1-370 
1-369 
1'370 
1-372 
1-375 
1-395 
1-35 
1-21 
1 21 
1 - 20 ' 
1-22 
1-25 
1-34 
1-18 
1-15 
1-11 
0-95 
0-90 
0-90 
0- 98 
1 50 
1- 16 
1-22 
125 
1-31 
1-30 
1-67 
1-66 
1-69 
1-64 
1-68 
1-63 
1-70 
1-84 
1-38 
086 
1-06 
100 
117 
MO 
1-70 
1-70 
= 0-508 or 1-000 
= 0-634 
„ 0-745 
„ 0-694 
,, 0 755 
» 0-717 
„ 0 625 
„ 0-680 
„ 0-805 
„ 0-900 
„ 0-925 
„ 0-977 
„ 0-850 
„ 0-658 
„ 0-576 
„ 0-562 
„ 1 022 
,,1-041 
„ 1-040 
„ 0 .921 
„ 1-058 
0 765 
„ 0-702 
„ 0-714 
„ 0-757 
„ 0-392 
„ 0 394 
„ 0-418 
„ 0-445 
„ 0-887 
„ 0-841 
„ 0-898 
„ 0-997 
„ 0-934 
„ 0-817 
„ 0-528 
„ 0-516 
or 1-248 
„ 1 467 
„ 1-366 
„ 1-486 
„ 1-411 
„ 1-230 
„ 1-339 
„ 1-585 
„ 1-771 
„ 1-821 
„ 1-923 
„ 1-673 
„ 1-295 
„ 1-148 
„ 1-106 
„ 2 012 
„ 2-049 
„ 2-049 
„ 1-813 
„ 2 083 
„ 1-506 
„ 1-382 
„ 1-406 
„ 1-490 
„ 0-772 
„ 0-776 
„ 0-823 
„ 0-876 
„ 1-746 
„ 1-675 
„ 1-768 
„ 1-963 
„ 1-838 
„ 1-628 
„ 1-040 
„ 1 016 
Horizontal intensity. 
On the 
authority 
of 
Mr. Airy. 
d 
Scale 
adopted in 
Report. 
3-79) 
1 
3-78 
3-83 ; 
1 3-80 or 1-000 
3-S2j 
I 
462 
or 1-217 
5-74 
„ 1-510 
5-85 
„ 1-539 
5-63 
„ 1-482 
4-46 
6-49 
6-16 j 
7-17 
1-174 
1-708 
1-602 
„ 1-887 
By 
GauBB. 
e 
Scale 
adopted 
in 
Eeport. 
515 or 1-000 
615 or 1-194 
750 , 
1-456 
750 , 
1-456 
740 , 
1-437 
760 , 
1-495 
715 , 
1-388 
660 , 
1-281 
805 , 
1-563 
820 , 
1-592 
830 , 
1-611 
875 , 
1-700 
830 , 
1-611 
700 , 
1-361 
620 , 
1-204 
610 , 
1-185 
1010 , 
1-961 
1000 , 
1-942 
1000 , 
1 942 
925 , 
1-796 
980 , 
, 1-903 
870 , 
1-689 
855 , 
1-660 
765 , 
1-485 
785 , 
1-524 
370 , 
0 719 
355 , 
0-689 
400 , 
0-777 
395 , 
0-767 
840 , 
1-631 
860 , 
1-670 
835 , 
1 621 
1000 , 
1-942 
865 , 
1-680 
890 , 
1-728 
500 , 
0-971 
495 , 
0-961 
On the authority of General Sabine, from Keith Johnston’s Physical Atlas, Second Edition, “ Terrestrial Magnetism.” 
c Computed from the formula X=Ecos 0, in which R denotes the total intensity, X its horizontal component, and 0 the dip. 
d Philosophical Transactions for 1856, Mr. Airy “ On the Observed De-viations of the Compass in Wood-built and Iron-built Sliips.’ 
e From the Atlas dea Erdmagnetismus of Gauss. Leipzig, 1840. 
/ Dr. J. L.uiont, “ Erdmagnetismus an verschiedenen Puncten des Siidwestlichen Earopa.” Munich, 1858. 
g Dr. F. Schaub, “ Magnetische Beobachtungen im Ostlichen Theile des Mittelmeeres.” Trieste, 1858. 
h From Captain Shadwell, R.N., Her Majesty’s Ship Highflyer. 
i From Lieutenant Gilliss, United States Navy. 
k From Captain G. H. Richards, R.N., Her Majesty’s Surveying Ship Plumper. 
