462 The Account of a 
No. of 
triangles 
Names of stations. 
Observed 
angles. 
Diff. 
Sphe rj _ 
cal 
excess. 
Error. 
Angles corrected 
for calculation. 
Distances. 
LXX. 
Pertinney 
Karnminnis 
St. Buryan 
u°3 40 15,5 
13 48 l8 
52 31 27,5 
u 
* 
0 > 0 
113 40 15 
13 48 18 
52 3‘ 27 
Feet. 
l8o O l* 
1 
0,16 1 
-40,84 
Pertinney from 
f Karnminnis 
\ St. Buryan 
4 H 07.7 
12450,2 
L X X I. 
Sennen 
St. Buryan 
Pertinney 
36 39 18,75 
75 3 6 n »5 
6 7 44 3 i 
36 39 18,25 
75 3 6 11 
67 44 3°>75 
180 0 1,25 
0,08 
+ 1,17 
Sennen from | 
St. Buryan 
Pertinney 
■ 
19300.8 
20199.9 
The angles in the above series of triangles, are those arising from 
taking the means of the several observations : and the same rules 
have been adopted for their corrections, which were laid down in 
the account of the trigonometrical operation, published in the 
Philosophical Transactions for 1795. The angle at Blackdown 
in the xlvii. triangle (for the triangles of the present series are 
numbered in order from those of the former), is considered to be 
nearly 2" in defect, and has been augmented for calculation accord- 
ingly : the angle at that station was observed under circumstances 
less favourable, than those which attended the observations made 
on Pilsden, and Charton Common. 
