SURVEY OF THE BRITISH ISLES FOR THE EPOCH JANUARY I, 1891. 335. 
Horizontal Force. 
G.M.T. 
H. 
Ho- 
1 . 
V 
h. m. 
14 44 
1-8461 
1-8470 
II. 
Y 
16 2 
1-8430 
1-8439 
570. PoRTMADOC. May 1, 1891 ; G. (60, 74). Lat. 52° 55' 20" ; Long. 4° T 50". 
On an open piece of ground between the two roads from Portmadoc to Borth. 
The latter bore 20° W. of S., and was about ^ mile distant. 
Declination. 
V 
G.M.T. 
c. 
^0- 
h. in. 
+ 1 24 
h. in . 
13 53 
19 20-4 
19 24-8 
Inclination. 
Needle. 
G.M.T. i 0. 
i 
6,. ' 
h. in. 
O / 
O / 
1 
12 45 
68 46-7 
68 47-2 
Horizontal Force. 
G.M.T. 
H. 
Ho. 
h. in. 
14 4 
,1-7509 
1 .r’.mo 
14 20 
1-7490 
1 ! 
571. Preston. See “ 1890 Memoir,” p. 18L 
572. PuRFLEET. See “ 1890 Memoir,” p. 181. 
573. Pwllheli. See “ 1890 Memoir,” p. 182. 
