Himavava Movunrarys. 267 
5. Nonsz of the angles on the sine of which any connecting side 
depends is less than 49, except in one triangle, (the 15th) and in this the 
angle is 16, but from this a very short side of 17,000 feet only is concluded, 
as part of a longer side of 58,000, from which the series was te continue, 
The reason of requiring this small side, (the distance of the 12th and 13th 
stations), was an inability to distinguish the 13th station from the 10th. 
I was therefore obliged to make a quadrilateral of the 10th, 11th, 12th and 
13th, The,distance of the 11thand 13th is checked by 2 other quadri- 
laterals, in which other stations .were substituted for the 12th. I have 
aumbered these in the order. of the triangles. This method of deducing 
a side, from the known angles and all the sides, but one ‘or two, of a 4, 3; 
or 6, sided figure is very convenient, and I think equally satisfactory, as 
the more direct one of a triangle. I have therefpre not hesitated to employ 
it, as in the figures marked 23, 26, 28, 31, 33. 
6. Wear follows consists of, —first, a detail of the angles observed at 
each station with an account of the stations, and the reductions to the 
centre where required. ‘To this, I have subjoined a table of the angles 
reduced and arranged in triangles or quadrilaterals, with all the logarithms, 
necessary for their verification. Jt would appear to be affecting an accu- 
racy, of which operations (conducted with such limited means as ours), 
are not susceptible, to have used more than 6 figures of logarithms. In 
fact on an angle of 60, an error of 7 would produce an alteration of 8, 
in the 6th figures of the sine. And ona line of 21,000 feet, the error 
of two feet, which I suppose possible, might alter the logarithm 4 in the 
5th place. So that 6 figures appear to be more than sufficient. ‘The 
VOL. XIV. 3 Y 
