502 STAFF CAPTAIN EVANS, E.N., ON THE CHANGES OF POLAE MAGNETISM 
General Table (continued). — Her Majesty’s Ship Northumberland. 
Northumberland 
(continued). 
Starboard 
steering. 
Approximate coefficients. 
On stocks . . .Mar. and Apr. 1866 
Off Deptford April 19, 1866 
In Victoria 
Docks. 
( April 21, 1866 
May 29, 1866.. 
July 12, 1866 . 
Aug. 10, 1866.. 
Sept. 1, 1866 .. 
Oct. 24, 1866 .. 
(Dec. 17, 1866.. 
Sheerness Jan. 1, 1867 . 
Sheerness Jan. 26, 1867 . 
Sheerness Feb. 28, 1867 . 
Mar. 2,1867. 
Devonport ...Aug. 29, 1867. 
Devonport ...Dec. 10, 1867 . 
Devonport ...Dec. 10, 1867 . 
Port steering. 
Lower deck. 
Sheerness Jan. 1, 1867 . 
Sheerness Jan. 26, 1867 . 
Sheerness Feb. 28, 1867 . 
Devonport ...Aug. 29, 1867. 
Devonport ...Dec. 10, 1867 . 
Devonport ...Dec. 10, 1867 . 
Sheerness Feb. 28, 1867 • 
Devonport ...Aug. 29, 1867. 
Devonport ...Dec. 10, 1867. 
By deviation and forces on one point 
Exact coefficients. 
By deviation and force on one point ( head S. 22° W, 
magnetic). . 
Two iron-plated ships alongside steam machinery, 
iron masts, Sfc. placed on board during this interval. 
+0 09 
— o 24 
+0 41 
-O 18 
-39 50 
+15 18 1 
+ 6 39 
- 2 37 
+ 38 19 
+ 6 24 
- 5 20 
+40 41 
+ 6 28 
-4 15 
-1 04 
| + 6 42 
+ 0 42 
+ 2 40 
+1 44 
Ship in dock ( head S. 84° E. magnetic) 
+1 13 
— o 39 
+0 53 
+43 0 
- 4 13 
- 3 55 
+ 19 48 
— 10 52 
7 50 
+ 6 18 
+ 7 4° 
+ 6 54 
- 0 28 
— 2 11 
— o 12 
By deviation and forces on one point .... 
Ship in dock (head S. 84° E. magnetic) . 
- 3 23 
+ 11 
+•003 
— •007 
+•012 
-005 
+ 021 
—•on 
+0-15 
+ 13 02 + 0 32 
By deviation and forces on one point 
Ship in dock (head S. 84° E. magnetic) 
•003 
+•499 
+•491 
+ •455 
+•447 
+•150 
+•018 
-•108 
+ •022 
-071 
-•107 
+-105a 
+ .117a 
+ ‘105a 
+ 117a 
-(-•105a 
046 
-•725 
— •078 
-•071 
-176 
— •212 
-•218 
-065 
-025 
+•232 
+•596 
+•625 
-018 
+•637 
+•641 
•+617 
+•302 
— •176 
-•128 
+•150 
+•508 
+•481 
+•170 
+ 333 
+•412 
+ 116 
+•112 
+•113 
+ 117 
+•110 
+•1 10 
+‘ I2 7 a 
+•110 
+•133 
+•120 
+ -noa 
+-!27 
+•220 
+ 220 
—•008 
-•038 
— •003 
+•008 
Note. — The coefficients marked (a) are assumed values. 
