Hinawava Mounrains, 
aS 
C3) 
Coe 
ye 2s 
7)’ Havine finished on the 2d of March, the measurement of the base, 
I proceeded immediately to fix on stations for deducing from it the length 
of one of the principal lines, the distance of Swrkanda and Chandpii: 
peaks. ‘That distance as fmaally determined, was-found to be 225582 feet, 
and their elevation above the Doah respectively, 8258 ahd 754g feet... 
To connect these distant points by establishing stations between, I found 
2 very arduous task, and the difficulties I had to contend with, were so great, 
that the last.or 15th station was not finished till the 14th of May. . 
2. On the proper disposition of such a triangulation, ag much as 
on the measurement of the base, depends the accuracy of the final result. 
It'has ‘been given:as a rule to choose'the triangles, as nearly equilateral 
as possible, and this is ne doubt: proper, when the correctness of each 
pout may be-equally desirable. But, as itis difficult to find stations 
so conveniently situated, and:as the series generally is required to con- 
tinue only in-one-direetion, it seems allowable to admit of small angles, 
when no principal link of the chain depends on them... 
3: In-enquiring. what may be the probable error in the distance finally 
deduced from: this triangulation, we have to consider first the probable 
errorof the ‘base, and secondly the errors: of the angles arising from the 
want of power in the instrument, or ability in the observer. ~The former 
Thave stated at probably not exceeding two feet. The angular instrument 
has been already described. It is no doubt a very fine one. With a teles- 
