for ascertaining the velocity of sound. 
1 39 
TABLE X. 
The wind having been SW by l¥ , and NW, mean of the 
observations of three days. 
c 
Mean height of 
Number of 
Month. 
. ^ 
0 £ 
£ ^ 
O 
Barometer. 
Therm. 
Hygrom. 
Beats. 
Seconds. 
Weather. 
I 820. 
August. 
6 
Inches. 
29,972 
O 
81, 0 
Dry. 
9 > 7 
3D S 
I2,6o 
Cloudy and lightning. 
6 
2 9’97 4 
82, 0 
8, 0 
30,85 
12,34 
Mostly hazy. 
6 
29,915 
83, 2 
13 . 3 
3 i»«S 
12,46 
Ditto, ditto. 
6 
29,868 
8 5 . 4 
18, 0 
31, 0 
12, 4 
Cloudy. 
Sep. and Nov. 
6 
30,074 
81, 8 
16, 2 
3 1 , 0 
12, 4 
Mostly cloudy. 
Dec. and Mar. 
6 
30,076 
77 . 7 
3> 3 
3D 4 
12,56 
Hazy. 
Mean 
29,979 
81,85 
1 1,41 
12, 46 
TABLE XI. 
Mean motion oj sound for each month , according to the experi- 
ments with the Mount gun. 
Mean height of 
Month. 
Barometer. 
Therm. 
Hygrom. 
Velocity in 
a second. 
January. . 
Inches. 
30,124 
7 ° 9’°5 
Dry. 
6, 2 
Feet. 
I IOI 
February 
30,126 
78,84 
14 , 7 ° 
I I 17 
March. 
30,072 
82,30 
15,22 
"34 
April. 
30,031 
85,79 
17,23 
1145 
May. 
29,892 
88,1 1 
19,92 
1151 
June. 
29,907 
87,10 
24.77 
1157 
July. 
29,914 
86,65 
2 7 > 8 S 
1 164 
August. 
29,931 
85,02 
21,54 
1163 
September. 
29,963 
84,49 
,8 >97 
1152 
October. 
30,058 
8 4>33 
18,23 
1128 
November. 
30,125 
8i >35 
8,18 
I IOI 
December. 
30,087 
79>37 
D 43 
1 °99 
J. GOLDINGHAM. 
