518 
APPENDIX. 
[ Errors in variation. 
Observations in the Southern magnetic Hemisphere, continued. 
Time. 
jat. S. 
Lon. E. 
Az.or 
Amp. 
' 
Comps. 
Observers 
Ship’s Head 
Var. obs. 
Variation 
supposed 
true. 
Errors of 
observat". 
Err*: 
at 8 
points 
Dip 
S°. 
Remarks. 
1802 July, 
a. m. 28 
° / 
O / 
8 12 E. 
0 / 
Q / 
25 0 
153 23 Am P- 
No. 3 
c 
N. W. by N. 
9 39 E. 
1 2 / + 
2 36 
531 
Off Indian Head. 
a. m. 29 
24 43 
153 27 
— 
— 
F 
S. E. i S. 
6 33 
• 
1 39— 
Sept, 
a. m. 3 
22 23 
150 16 
Az. 
No. 1 
S. E. by E. 
6 31 
8 45 
2 14- q 
2 41 
501 
J: Shoal-water R 
_ 
. 
No. 2,3 
W. N. W. 
11 15 , 
— 
2 30 J 
Do. ship swung* 
Means 
2 39 
52 
11 1 ■ 
— * * 
1802 Nov 
p. m. 21 
p. m. 22 
December 
• / 
17 7 
139 43 
Amp. 
No. 3 
C 
F 
E.N.E. 
Northerly 
2 28 E. 
4 30 
4 10 
o / 
4 30 
2 40 
0 / 
2 2 — 
1 30+ 
o / 
2 12 
0 
441 
Investig*. Road. 
(G. of Carpent.) 
p. m. 8 
16 41 
138 27 
— 
C 
N.W. 
12 7 
431 
S. side of Gulph- 
p. m. 10 
1803 Jan. 
16 16 
137 57 
L “ " ■ ' 
W. by N. 
4 45 
0 43 
1 9 
2 5 + 
1 57-' 
1 31- 
p. m. 2 
p. m. 6 
14 If 
14 If 
136 1 
136 22 
__ 
E. by S. 
S.E. 
— 
2 4 
411 
Near Groote Eyt 
1 
Means 
|2 8 
43 
- 
67°, error for eight points 3° 28', or in parts of the dip ,0517 
- *0492 
- - ,0473 
,0510 
,0496 
64 - ~ 3 9 
62 - - - 2 56 
52 - - - 2 39 
43 - - 2 8 
Mean error for eight points in parts of the dip ,0498 
The medium error for eight points deviation of the Investigator’s head 
on either side of the magnetic meridian, was therefore very nearly one- 
twentieth part of the dip ; and (,0498 called) ,05, the decimal expression 
of it, is the common multiplier to the dip for obtaining the radius of error 
at any situation in the southern hemisphere ; as the (,0531 called) ,053 
from the first table, is the common multiplier from England to the magnetic 
equator. Had the observations in both hemispheres been equally numerous, 
the multipliers might perhaps have been exactly the same ; but it is also 
