Table V. — Horizontal Deflections of the Magnetic Needle observed at seven different parts of the Garry o wen. 
274 
COMMANDER JOHNSON’S MAGNETIC EXPERIMENTS 
Deviation 
or local 
attraction 
at binnacle. 
O M3 O M3 O M3 
N co tji co ^ co •— i 
CO o© CO OOiOi 
O f-H pH pH pH i— I i— t 
© M3 © 
© © CO 
rH rH 
9 0 
11 15 
16 30 
19 45 
j-23 30 
22 15 
26 30 
27 45 
© M3©M3©M3© M3 © 
pH CO ^ CO pi CO ph 
© h* ^ o* ©»>%©© W 
^CO^ W WW H PH w 
Direction of 
vessel’s head by 
compass in 
binnacle. 
N. 17 OE. 
rlO 0 
28 0 
not observed. 
N. 59 OE. 
r 64 0 E. 
N. 76 0 E. 
N. 87 OE. 
S. 82 0 E. 
S.71 0E. 
r 71 0 
S. 62 OE. 
not observed. 
S. 42 OE. 
not observed. 
S. 9 0 E. 
South. 
S. 6 0W. 
S. 14 0W. 
S. 20 0 W. 
r23 0 
34 0 
41 0 
51 0 
S. 58 0 W. 
9-62 0 
S.77 0 W. 
W. 2 0 N. 
N. 79 0 W. 
N.52 0W. 
r 59 0 
41 0 
12 0 
N. 2 0 W. 
N. 11 0E. 
9- N. 5 0 
Deviation 
or local 
attraction 
at S. 
O M3©M3 © M3 © M3 
CO 1 H CO ^ 
co o oi coi>%»-h 
O rH 
© M3 © M3 © M3 © M3 
HCO^ rn CO ^ 
h* CO©M3 CO © M3 CO 
rH r— < pH p-i rH iH r-i pH 
111 0 
J 11 15 
7 0 
3 45 
}.2»{ 
9 45 
11 30 
16 15 
MS M3©M3M3M3© M3 © 
M3 h* H T? ^ ph 
O* CO ^ (M W N © ^ © 
Direction of ! 
vessel’s head by ! 
compass in iron 
sphere S. 
©©©©©©©©©© 
" CO co 
C5©M30*~^H^©©*>* 
° rH (N CO ^ M3 © © 
fc & ** 
w w w p4 w 
©© ©©©©©©© 
©©QO'^5^M3rH©GOM3 
O*WG000t^©©M3C0<M 
** gj «5 go *• co 
W H £ £ pi 
•©©©©©©©© 
*5 CO 
CO© 5m3©^M3(M©©M3 
rH ^ rH CO ^ ^ ^ © »>% QO 
CO 05 CO ^ CO ^ 
N. 69 0W. 
r 65 10 
55 0 
43 30 
34 0 
20 0 
9-24 30 
16 0 
N. 6 30 W. 
N. 1 0 E. 
N. 9 0 E. 
Deviation | 
or local 
attraction 
at D. 
x lf3 M3©M3 © M3©© 
h* ^ ^ ^ CO 
O -rt< M3M3M3 © 
M3 M3©M3 © M3©M3 
ph ^ ^ co rt< co co 
*>•»>*© <M © (M 
© M3 © M3 M3 M3 © M3 
CO C^CO^ pH h co H 
(M ^ M3 © CO 00 
}G, 5 { 
4 45 
1 0 
0 15 
}2‘ 5 { 
3 15 
5 0 
1 45 
} 5 0 
Direction of 
vessel’s head by 
compass on fore 
part of poop D. 
w w 
^© ©©©©©©©©© 
co coco co co 
„M3 ©OlTt< M3 
° rH ©* CO M3 M3 © 00 
' £ 
?■* 
w w 
©©©©©©©©©© 
CO CO co co co M 3 
(MCOrH©CC©©^COCO 
GOCO*>.©^^^COO^rH 
co ^ co ^ 
S. 2 0E. 
9-2 30 E. 
S. 6 50 W. 
17 0 
26 0 
35 30 
r 36 0 
48 0 
59 0 
71 30 
S. 83 30 W. 
r 84 0 
N. 83 30 W. 
68 30 
56 30 
43 0 
9- 42 30 
30 30 
17 30 
13 0 
N. 6 30 E. 
r N. 3 30 E. 
Deviation 
or local 
attraction 
at E. 
M3 M3 © M3 © M3 © M3 
^ pH i — * pH ^ rHl tJI 
pH pH © CO © COMO© 
O pH pH rH 
M3 M3 © M3 © M3 © M3 
^ rH pH H JO ^ 
© T* 0* © CO 
pH pH rH r“ ^H rH rH 
M3 M3 © M3 © M3 © M3 
^ Tti ^ H CO rti 
CO ©CO© © (M ^ © 
© M3 ©M3 © M3 © M3 © 
CO CO HH Tjt M3 
t>*t'%^oi©ao m3 *h 
H rH IH I-H pH ph 
Direction of 
vessel’s head by 
compass on 
poop E. 
SB W 
oooooooooo 
'CO co co •'t 1 co 
— H r-<©©lO'SI- , ^COOrOr 
0 -H I-I Or CO CO ^ us to 
AA A 
S* 1 
W WWW 
©©©©©© ©©© 
co co co 
(MC^M3Ht<(3^t> fc rH^OCO© 
l>*t>*GOCO»>*M3©'^CO(N 
£ *• 
S. 4 0E. 
9-3 30 
S.10 30 W. 
25 30 
40 30 
53 30 
54 50 
69 0 
S.82 0W. 
N. 84 30 W. 
N. 73 30 W. 
72 30 
N. 61 40 W. 
50 30 
41 40 
32 30 
32 30 
23 30 
14 30 
5 30 
N. 2 0 E. 
r N. 1 40 E. 
Deviation 
or local 
attraction 
at L. 
>.© M3©M3 M3 M3 © M3 
CO pH M3 ^ CO H 
©* ©H0 © CO © 
0 HH H IM^CO 
© M3© -M3 © <-h © M3 
CO Tt* co (MCO^ 
hH COb*t>* oo CO © h 
CO pH CM CO <M CO (M 
© M3 © M3 © M3©M3 
pH ,H HCOH 
© © © <N co 
h (N Ol CO CO CO CO 
v — v — J v — v — 1 ' — v — - 
© M3©M3M3M3© © Mi 
HJ< H TP ^ CO 
rH 00 © rH © © M3 © 
CO W WW H H 
Direction of 
vessel’s head by 
compass on 
stage L. 
pi W 
© ©©©©©©©© 
" pH CO H CO CO 
M3 rH »>* © GO © 
O H h (M (M CO co Tf 
~ 
r N. 55 30 E. 
55 30 
65 0 
N. 74 30 E. 
N. 84 0 E. 
S. 83 30 E. 
r S. 83 6 E. 
67 6 
53 6 
33 0 
rS. 6 30 E. 
1 30 
S. 21 30 W. 
42 30 
63 0 
r S. 78 0W. 
76 0 
W. 0 30 N. 
N. 78 0W. 
N. 68 0W. 
N. 58 0W. 
9-60 0 
N. 50 0W. 
41 30 
35 0 
9-27 0 
27 30 
20 0 
13 0 
6 15 
N. 0 30 W. 
r N. 1 0W. 
Deviation 
or local 
attraction 
at G. 
^ M3 ©©M3 © M3©M3 
H CO ^ H CO Cl 
O© ©rH© CO Ol ^ 
© M3 M3 M3 © ©©© 
CO H Tjl pH CO 
<MC0<M <M O* © © 
O M3 © M3 O M3 © M3 
H CO H CO Tj< M3 pH 
(M © © *H O HOW 
© m ©in © m © in © 
bjii n ■# '•r 
— < co ©or or or or © © 
Direction of 
vessel’s head by 
compass near 
gaff G. 
°0 30 E. 
North. 
N. 11 OE. 
21 30 
33 0 
42 0 
54 30 
65 0 
74 30 
WWW 
©©©M3©©©M3©© 
h CO CO co CO 
©©pHpH©©O*M3C0pH 
C>DCOCO»>*M3'^T}<COOlrH 
W W pi ^ 
©©©©o ©©©©© 
co co co CO CO <N 
WhhcoWMStP^CCXh 
pHC<|CO'^'^’^M3©GO 
WWW co *- 
N. 89 0W. 
9- N. 89 0 W. 
N. 82 30 W. 
67 0 
54 0 
r 44 30 
42 30 
31 0 
20 30 
r 11 0 
13 0 
N. 0 30 E. 
r N. 0 30 N. 
Deviation 
or local 
attraction 
at C. 
0 / 
1 12 
0 0 
1 0 
1 24 
>2 48 
2 48 
2 48 
2 48 
^©""^ © ^ ^ © © ^ © 
<M (N CO <M 
pH pH pH pH pH (M H O 
M3 © ^ ' © ' ©©© 
rH Ol (M 
pH HHH OJ rH © pH 
© © scr © «>. © oo © 
CO •“> CO 'C f 
or co in 'j* © w co or or 
» ’ r i 
' ’ • 1 
r u r r l r ^ L 
Direction of 
vessel’s head by 
compass on bow- 
sprit C. 
02 . 02 . 
z - o “■ -I=a5 o5 g, «> „• 
r S H - 
W CO 5- CO 
.05 .05 . . w " t> 
«J .10,05 ^ 50 0^ P- 
w> -t ^*05 fe cc ^ co ^ p: £ 
! '«5 a5 «5 M . ^ *.g ^ 
WWW 
rt f HWlZi £ | ^ H^Hlt 
^ 5 *« ^ 
True mag- 
netic direc- 
tion of the 
vessel’s head. 
U ^ - 0 z 
East, 
E. by S. 
E.S.E. 
S.E. by E. 
S.E. | 
S.E. by S. 
S.S.E. 
S. by E. 
South. ^ 
S. by W. 
S.S.W. 
S.W. by S. 
S.W. | 
S.W. by W. 
W.S.W. 
W. by S. 
i ££ & i 
£ ■*. z £ z. £ % 
^ ^ 'A & 'A 
-oraiaqx 
t_ v 1 ' Y — .A . --v "■■■ — V " ^ 
o t*. t>. «o 22 
-* -f ' r T 
IO M3 ms T** 
r signifies that the observation was repeated : and it will be observed that at some of the positions nearest to the iron-work (such as the binnacle) considerable discrepancies occurred. 
