318 »AN ACCOUNT OF THE 
no:case is the refraction in viewing a snowy peak from an: elevation of, 
7,000 feet, so great as i of the arc, while the distance also is never 60. 
Te following table, contains. all. the elements of the calculation: of the: 
elevations of the snowy peaks. The formulas H = D.tang. CE + 7} — 
+3) where H, means the height, D the distance in feet, ? the angle subten- 
ded between the verticals of the two places,.and HE’ the: observed: altitude. 
In finding } allowance has been always.made for the figure of the earth by 
using table 3 of the appendix.. 
Accompanyine there is given-a- catalogue of latitudes and longitudes of ” 
all the positions that are trigonometrically determined, with the elevations: 
of as many as have yet been fixed:. The formula.used.is sufficiently ex-. 
plained in the appendix.. It only remains to.say;.that the latitude of Bel-- 
qille has been assumed as that likely to be nearest the truth, being deter-. 
mined from a greater number of observations, and. under more favorable - 
circumstances.. 
Tue Azimuth of the Chir station from Belville, was determined, by.a 
mamber of double elongations of the pole star, made by both observers, with 
tine oe to be 3 95 05 W. of N.. Azimuths. were also observed from, 
the Chir, from Sur anda, Bairat, Uchaléré and Kédar-Kdnta. The 
several differences of Azimuth being calculated iby the formula, and tables 
given in the appendix, and applied to these, the differences are. in no case 
found to exceed what may be fairly attributable to observation, that is to. 
say, they never exceed a - Bat as all, except the Azimuth from Bairdt, were 
