194 : AN ACCOUNT OF THE 
ef the.zenith, will shew that the differences are less, than could be expec 
ted, and how closely our mean results agree, indeed I think too close, but 
they are fairly stated. "Though at Belville we could observe at our ease, it 
was not so on our lofty stations. of the Chir’, Surkunda, and Bairdt 
amidst snow, ice and: ‘clouds, and exposed to furious tempests, which the 
astronomer in his firm observatory never experiences. But even the mean 
of Lieutenant Herserr’s observations and mine, varied atthe Chi*, only: 
4, which is less than. could be expected:—T'wo observers may. chance 
io find the same result, and yet it may not be: true. . Whether it be 
so, or not; may be proved. ‘Te prove, whether, the difference of latitude 
of our large are, Belville and the Chur, was certainly determined, 1 estas 
blished a third or proof station on the fort of Bairdt, the three places mak-. 
ing a well proportioned triangle. Bairdt is a small fort.on the summit of a, 
mountain in Jaunsar...The station of: observation is in the fort, and. 
distant from. Beluille 2,59,129 feet, and 6,556 fect nearly above its-level.. 
There, as on the Chis and at Belville, a great number of observations. 
for the latitude were made, by. Lieutenant Herperr and myself at dif 
ferent times, but with the same reflecting circle: but the mean of our ob- 
e v ° ° 
servations differed 7,* At all the three stations, the angles and Aziumuths 
were carefully observed, as will be shewn in the detail, yet Ss) had_ the 
mortification to find that the latitude of Bairdt, as deduced. by strict. 
calculation on the latitade and Azimuth arc, or. base of the Chir and 
#75 is too great a discrepancy to be fairly attributable to error of observation only, peer it 
may have been causea in part, by the varying state of celestial refraction. I observed at Bairdt in 
tempestuous weather, and was much interrupted by storms of wind, snow and sleet, and the atmosphere. 
to the north zenith was generally cloudy. Lieutenant Wergert was rather more favored by the 
weather, and his observations there are preferable to mine. 
