for ascertaining the velocity of sound. 
127 
TABLE IV. 
The wind having been north easterly. Mean of the observations 
of three days. 
JZ 
C 
<+* O 
O *3 
Mean height of 
Number of 
c 
0 
§ 
. cd 
O > 
25 §j 
jz 
0 
Therm. 
E 
O 
3 
n 
Hygrom. 
Beats. 
Seconds.! 
Weather. 
1820. 
Oct. 
6 
82 
Inches. 
30,094 
Dry. 
2 
66, 5 
// 
26, 6 
Mostly hazy. 
Nov. 
6 
8 3>9 
30,131 
S > 6 
66,65 
26, 66 
Clear and cloudy alternately. 
6 
81,9 
30,184 
12,3 
66,75 
26, 70 
Clear. 
6 
81,5 
30,1 IO 
4,8 
66,65 
26, 62 
Clear. 
Dec. 
6 
80,9 
30,106 
4,2 
67, 5 
27, 00 
Clear. 
1821. 
Jan. 
6 
7 8 ,4 
30,102 
5>7 
67,85 
27, 14 
Mostly cloudy. 
6 
80,6 
3 °, i +5 
2,7 
67,25 
26, 90 
Clear and cloudy alternately. 
6 
79>7 
30,139 
8,2 
67,06 
26, 82 
Clear. 
Feb. 
6 
79 > 6 
30,150 
14,8 
67,55 
27, 02 
Clear. 
6 
80,3 
30,186 
13^2 
66, 7 
26, 68 
Mostly clear. 
Oct. 
6 
84,0 
30,08 1 
21 
66,75 
26, 70 
Ditto. 
6 
8 5,9 
30,076 
21,7 
66, 7 
26, 68 
Mostly hazy. 
6 
83,2 
30,074 
22,2 
67,45 
26, 98 
Cloudy, and rain. 
Nov. 
6 
82,7 
30,063 
9,3 
66, 6 
26, 62 
Ditto, ditto. 
6 
81,1 
30,062 
16,6 
67,65 
27 06 
Clear. 
Mean 
81,7 
30,113 
10,9 
26,812 
