MR; A. W. RUCKER AND DR. T. E. THORPE ON A A[AGNETIC 
Inclination. 
Date. 
Needle. 
G.M.T. 
-1 
1 
h. m. 
0 i ! 
Aug. 18 
1 
12 29 
67 53-3 . 
2 
13 9 
^ 67 o4'0 
IIorizontcd Force. 
Date. 
G.M.T. 
H. ! 
Ho- ! 
i 
T 
1 
m. 
I 
1 
, Aug. 16 
D 
' 13 
28 
I 
A' 
15 
O 
1-7980 
V 
15 
r-8 
1-7955 
1-7981 
„ is 
A^ 
11 
25 
1-7956 
A’ 
13 
46 
1-8U02 
1 
568. Port Erin. See “ 1890 Memoir,” p. 180. 
569. PoRTHALLow. August 4, 1890 ; G. (60, 74). Lat. 50° 4' 20” ; Long. 5 4' 53”. 
Ill a field just S. of Roskorwell Farm-house, on the E. side of the St. Kevern 
Road. 1st position, 50 yards N.N.W. of 2nd. The value of H found at the 
first station was alone used in calculating the Disturbing Forces. 
Declination. 
G.AI.T. 
f. 
^0- 
I. 
h. 111. 
+ 1 40 
h. m. 
14 28 
19 24-9 
O . 1 
19 22-3 
’ 
11 . 
+ 2 54 - 
15 48 
- 19 25-1 
Inclination. 
Needle. 
G.AI.T. 
9. 
_^0-. 
I. 
1 . 
b. m. 
12 54 
O ! 
67 6 6 
o / - 
67 5-5 
2 
13 20 
67 6-0 
