ON AN IRON STEAM-VESSEL, 
277 
Table VI. 
Register of the Dip of the Magnetic Needle observed at three positions on board the 
Garryowen, and compared with that observed on Tarbert Island. 
At Tarbert Island, 
Nov. 16, 1835. 
At position A on board, Nov. 2, 1835. 
At position B, Nov. 6. 
At position I, Nov. 13. 
c 
o 
£ 
3 
u 
O 
O 
V 
Poles of needle direct. 
Reading of needle. 
Poles of needle direct. 
Poles of needle direct. 
Poles of needle direct at I. 
Vessel’s head north. 
Vessel’s head south. 
Vessel’s head north. 
Vessel’s head south. 
Vessel’s head north. 
Vessel’s head south. 
Reading of needle. 
Reading of needle. 
Reading of needle. 
Reading of needle. 
Reading of needle. 
Reading of needle. 
Lower end. 
Upper end. 
Lower end. 
Upper end. 
Lower end. 
Upper end. 
Lower end. 
.Upper end. 
Lower end. 
Upper end. 
Lower end. 
Upper end. 
Lower end. 
Upper end. 
Face of needle to face of 
instrument. 
42 
in 
« 
w 
0 / 
70 20 
70 20 
o / 
70 15 
70 15 
78 6 
vibrating to 
78 15 
o / 
78 5 
o / 
73 25 
vibrating to 
73 45 
o / 
73 15 
vibrating to 
73 45 
Weath 
favou 
er un- 
rable. 
*« 
. 
o / 
66 45 
vibrating to 
67 30 
o / 
66 30 
vibrating to 
67 15 
0 / 
72 30 
vibrating to 
73 15 
o / 
72 45 
o / 
74 45 
vibrating to 
74 30 
74 50 
in 
71 25 
71 30 
71 20 
71 25 
78 30 
vibrating to 
79 0 
78 40 
74 0 
vibrating to 
74 40 
73 40 
vibrating to 
74 40 
Notob 
served. 
68 30 
68 40 
73 30 
vibrating to 
74 0 
73 40 
74 15 
74 20 
£ 
u 
O 
£ 
JZ 
3 
O 
89 30 W. 
or 31' W. 
of 90°. 
89 25 E. 
or 35' E. 
89 25 E. 
or 35' E. 
of 90o. 
89 30 W. 
or 30' W. 
Barom. 29*8, Therm. 49° .—A slight motion 
in the vessel. 
Barom. 29'9, Them. 44°. 
Barom. 30'5, Therm. 46°. 
Arithmetical mean of the dip observ 
and with 
At position A (abaft). 
Vessel’s head north. 1 Vessel’s head south. 
78° 25' 0" 1 73° 54' 0" 
ed on board the Garryowen, with the fat 
the face of the needle to the face of the 
a . t> 
:e of the instrument at east and west, 
nstrument. 
At position I (abaft). 
Vessel’s head north. 1 Vessel’s head south. 
73° 16' 40" 1 74° 0" 
Face of needle reversed. 

' 
- 
4J 
in 
C3 
71 15 
71 15 
71 15 
71 10 
Vessel’s head north. 
Not observed. 
Vessel’s head south. 
67° 31' 40" 
| South. | North. | West. 
70 30 
70 25 
70 25 
70 30 
Arithmetical mean of the dip observed or. Tarbert Island. 
Poles of needle direct, with the face of the instrument to the east and then to the west, i 
and with the face of the needle to the face of the nstrument 70° 51' 15". 
Ditto, with the face of the needle reversed 70 0 50' 37". 
Between each observation the needle was lifted on the Ys. 
89 35 E. 
or 25' E. 
89 30 W. 
or 30' W. 
89 35 W. 
or 25' W. 
89 15 E. 
or 45' E. 
Barom. 30'1, Them. 46°. 
During these observations the vessel sheered 2° to the east of south. 
