644 Meteorological Register at Barelly, in 1831. [Dxc. 
year, 15 observations gave the altitude, feet 6777.7, and another set of 
10 made it, feet 6775.1, and then the latter were taken after a long 
‘march in the hills, during which the barometer had been repeatedly 
refilled. I have a barometer made by Bate, on the principle of 
Guy Sussac’s syphon barometer, with Captain Kater’s improvements, 
(that is the description given of it,) and it seems in excellent order. 
This stands about .05 higher than a barometer of the above simple 
make, and filled in the same easy manner as above mentioned. (I should 
mention that the tubes used have all been of large bore.) But I have 
no means of discovering the error of either. 
The following observations were made at Hardwar, near the centre 
of the pass, in a house about 150 feet above the bed of the Ganges : 
Bar. 32°. Wher. 
1833, May 24, 77 A.M. 28.216 84 at 10 P.M. suddenly came a cool 
920 A.M. .236 96 breeze and reduced the Ther. to 91. 
Noon .. -224 100 
2, PAA 182 106 
As Pee 103 104 
Sunset .. -107 99 
95 P. M. -119 = =98 
» 25, Sunrise.. S300 75 
7 A.M. -220 =83 
9 A.M. AH ees 
Noon .. SCALP 
2. Pa VE, .187 106 
The height deduced from comparison with corresponding altitudes in 
Calcutta is, from those in the Journal*, 1214 feet above Calcutta, and 
from those at the Surveyor General’s Office, 1276 do. 
The latter are more numerous. The mean of these would be about 
1245 feet, and if the estimated altitude above the river be deducted, 
it would leave the height of the Ganges at Hardwar above Calcutta 
about 1095 feet. The barometer used was, as before, a plain tube, 
freshly filled with mercury. Though not tried, I suppose the depression 
of the moist bulb thermometer must have been near 3 0. 
In elucidation of the remarks on filling barometers when the air is 
damp, (vide Journal of the As. Soc. ii. 260.) I may record the following 
experiments made by myself: 
On the 12th July last, when the depression of the moist bulb ther- 
mometer was 93°, I filled a tube which stood exactly the same as one 
filled on the 3rd June, when the air was very dry ;-in both these tubes 
* My barometer stands on an average .044 lower than the Surveyor General’s, 
which will make an addition of 50 feet necessary to the altitude calculated.—Ep. 
