SI 
Experiments and Discoveries. 
The following Table shews the Variation as observed with 
and without the Plate , at different times during the Voyage. 
Latitude. 
Longitude 
Ship’s head. 
V ariation 
without the 
Plate. 
Variation 
with the 
Plate. 
Time of obser- 
vation. 
65° 6 N 
Ditto 
66 57 
66 15 
66 35 
67 21 
Ditto 
69 8 
Ditto 
6° 54 / E 
Ditto 
7 20 
8 0 
9 12 
9 4 
Ditto 
14 30 
Ditto 
North 
NE 
North 
E g N 
NE g E 
NE 4 E 
West 
NE 
West 
f 26° 1W 
| 11 28 
24 52 
2 14 
11 58 
f 18 4 
(43 5 
J 13 35 
( 40 37 
24° 23 W 
25 2 
25 30 
21 15 
22 43 
22 12 
20 0 
13 35 
14 28 
May 18. 1823. 
Do. do. 
May 20. 1823. 
Do. do. 
Mav 21. 1823. 
May 23. 1823. 
Do. do. 
May 28. 1823. 
Do. do. 
A single glance at this Table is sufficient, to perceive the very 
irregular character of the variations, as determined without the 
plate, and their close approximation to uniformity when the 
plate was affixed. 
Extract from Journal of H. M. S. Griper. 
II. M. S. Griper at Sea , 25th May 1823. 
Courses 
Courses by 
Winds 
H. 
If. 
F. 
with Plate 
Compass 
by 
Lee- 
Officers 
Compass. 
without 
Plate 
way. 
Initials. 
Plate. 
Compass. 
1 
3 
.. 
ESE 
E by N 
2 pts. 
2 
3 
.. 
NE 
3 
3 
4 
F. G. 
4 
3 
4 
5 
3 
• , 
6 
3 
.. 
E by S 4 S 
E by N 4 N 
ditto 
T. D. 
7 
3 
.. 
8 
3 
.. 
E by S 
EXE 
NE bv N 
ditto 
H. F. 
9 
3 
2 
E by S 4 S 
E by N 4 N 
1 pt. 
10 
3 
2 
E by S 
ENE 
ditto 
11 
3 
.. 
E 4 s 
ENE 
ditto 
P. G. 
12 
— 
2 
6 
1 
3 
- 
E by S 
E by N 4 N 
4 pt. 
2 
3 
- 
ESE 
E by N 
NE by N 
ditto 
3 
3 
.. 
4 
3 
.. 
T. D. 
5 
2 
6 
6 
2 
4 
SE by E 4 E 
E 
ditto 
7 
1 
.. 
N by E 
N by E 4 E 
E by N 
None 
8 
1 
6 
H. F. 
9 
1 
6 
10 
1 
6 
11 
2 
.. 
N 4 w 
N 4 E 
ENE 
P. G. 
12 
2 
•• 
Lat. 69° 16p N. 
Long, by Chr. 7° 54' E. 
Remarks, &c. 
P. M. 
Fresh breezes and cloudy 
4-. Fresh breezes with a 
head swell. 
Variation 2 points west. 
8. Squally w r eather. 
More moderate — set top- 
gallant sails. 
Midnight, moderate, and 
fine. 
A. M. May 26. moderate 
and fine. 
4. Fine clear weather- 
set royals. 
6’ 1 30 m tacked. 
8. Moderate and fine. 
Lat. observed at Noon, 69° 12' 10" N. ; Long, by Chr. 10° 14' 15" E. 
VOL. XI. NO. 21 . JULY 1824 . 
F 
