584 mr. Hudson’s hourly observations on the barometer 
Sixth set of fifteen clays’ Observations. July 14th to July 28th, 1831. 
II. Royal Society’s Standard Barometer. 
Times of 
Observation. 
Number of 
Observations 
at each hour. 
Barometer. 
Attached 
Thermometer. 
Thermometer 
at Vacuum 
Chamber. 
Barometer 
reduced to 
32°. 
Difference of 
Barometer 
from Mean. 
h 
A.M. 1 
15 
inches. 
29-917 
65-9 
65-0 
inches. 
29-812 
—•004 
2 
15 
29-913 
65-6 
64-7 
29-809 
-•007 
3 
15 
29-911 
65-4 
64-5 
29-808 
-•008 
4 
15 
29-902 
65-5 
64-4 
29-799 
-•017 
5 
15 
29-907 
65-3 
64-5 
29-804 
— •012 
6 
15 
29-915 
65-6 
65-3 
29-811 
-•005 
7 
15 
29-924 
66-3 
66-3 
29-818 
+ •002 
8 
15 
29-928 
67-0 
66-7 
29-821 
+ •005 
9 
15 
29-931 
68-3 
67-7 
29-820 
+ •004 
10 
15 
29-932 
68-6 
68-0 
29-820 
+ •004 
11 
15 
29-931 
69-6 
68-2 
29-816 
•000 
12 
15 
29-931 
69*9 
68-3 
29-816 
•000 
F.M. 1 
15 
29-929 
70-0 
68-7 
29-813 
-•003 
2 
15 
29-927 
70-2 
69-0 
29-811 
-•005 
3 
15 
29-924 
70-4 
69-0 
29-806 
— •010 
4 
15 
29-922 
70-4 
68-8 
29-804 
—012 
5 
15 
29 - 918 
70-2 
68-5 
29-801 
-•015 
6 
15 
29-919 
70-0 
68-0 
29-802 
— •014 
7 
15 
29-923 
695 
67-5 
29-808 
-•008 
8 
15 
29-932 
68-7 
66-7 
29-820 
+ •004 
9 
15 
29-944 
67-9 
66-5 
29-834 
+ •018 
10 
15 
29-946 
67-4 
66-0 
29-838 
+ •022 
11 
15 
29-948 
66-9 
65-8 
29-842 
+ •026 
12 
15 
29-947 
66-6 
65-6 
29-841 
+ •025 
29-926 
68-0 
66-8 
29-816 
The thermometer placed in contact with that portion of the glass tube of the 
Standard Barometer forming its vacuum chamber, was a very delicate instru- 
ment, made by Crichton. 
