MR. HUDSON’S HOURLY OBSERVATIONS ON THE BAROMETER. 585 
Sixth set of fifteen days’ Observations. July 14th to July 28th, 1831. 
III. Mountain Barometer. 
Times of 
Number of 
Observations 
Barometer. 
Attached 
Barometer 
Difference of 
Observation. 
at each hour. 
Thermometer. 
reduced. 
from Mean. 
h 
inches. 
inches. 
A.M. 1 
15 
29-871 
63-9 
29-816 
—•007 
2 
15 
29-867 
63.7 
29-813 
-•010 
3 
15 
29-865 
63-3 
29-813 
—•010 
4 
15 
29-861 
63-0 
29-809 
— •014 
5 
15 
29-862 
62-7 
29-810 
— •013 
6 
15 
29-868 
62-7 
29-816 
-•007 
7 
15 
29-874 
62-8 
29-822 
-•001 
8 
15 
29-877 
63-1 
29-824 
+ •001 
9 
15 
29-878 
63-7 
29*824 
+ •001 
10 
15 
29-879 
64-0 
29-824 
+ •001 
11 
15 
29-878 
64-2 
29-822 
-•001 
12 
15 
29-882 
65-1 
29-824 
+ •001 
P.M. 1 
15 
29-883 
65-4 
29-824 
+ •001 
2 
15 
29-879 
65-7 
29-819 
-•004 
3 
15 
29-877 
65-8 
29-817 
-•006 
4 
15 
29-874 
65-9 
29-814 
-•009 
5 
15 
29-872 
65-6 
29-813 
—•010 
6 
15 
29-873 
66-0 
29-813 
—010 
7 
15 
29-878 
65-8 
29*818 
— •005 
8 
15 
29-887 
65-6 
29-828 
+ •005 
9 
15 
29-896 
65-4 
29-838 
+ ■015 
10 
15 
29-899 
65-1 
29-842 
+ •019 
11 
15 
29-902 
64-9 
29-845 
+ •022 
12 
15 
29-901 
64-6 
29-845 
+ •022 
j Mean .... 
29-879 
64-5 
29-823 
The direction of the wind and state of the sky were also registered every 
hour daily, from 3 a.m. to 9 p.m., and striking changes in the weather noted, 
during these fifteen days. 
