5 i° The Account of a 
No. of j 
triangles. 
Names of stations. 
Observed 
angles. 
Diff. 
Spheri- 
cal 
excess. 
Error. 
Angles corrected 
for calculation. 
XXXIX. 
Beachy Head 
Rook’s Hill 
Chanctonbury Ring 
0 , // 
7 42 37 
H 1 7 33»25 
*57 59 5o.75 
+ 2,56 
+ 5. 12 
— 8,85 
* 
° / // 
7 42 4° 
H 17 38 
157 59 42 
: ' 
0 
0 
00 
Cl 9 
— 0,19 
By this triangle, with the side Chanctonbury Ring and 
Rook's Hill, as found by the second branch, we get the dis- 
tance between Chanctonbury Ring and Beachy Head, 157592,5 
feet ; and by the following triangle 
XL. 
Beachy Head 
Ditchling Beacon - 
Chanctonbury Ring 
13 58 29,5 
H3 9 3 1 »5 
22 52 3,25 
+ 0,48 
- 2,35 
+ 0,99 
13 58 28 
143 9 30 
22 52 2 
1 80 0 4,25 
o.9 
+ 3.35 
using the side Chanctonbury Ring and Ditchling Beacon as 
got by the second branch, we get another distance between 
Beachy Head and Chanctonbury Ring, namely, 157590,8 feet; 
wherefore the mean distance is 157591,6 ; and this, with the 
39th triangle, give 239160,2 feet for the distance between 
Rook's Hill and Beachy Head : hence we have four principal 
distances, namely, 
Dunnose from (Rook's Hill - i 43558 , 4 l feet 
Dunnose Irom (chanctonbury Ring 2 14498,4/ teet 
Beachy Head from! 5 ?°^ tT- 2 39 1 6o,2l f ee t. 
J [Chanctonbury King 157591,6/ 
And these sides used in the following triangles. 
