for ascertaining the velocity of sound. 
129 
TABLE Vi. 
Experiments for ascertaining the Motion of Sound with a gun placed on the Ramparts of . 
Fort St. George. Station at the top of the Madras Observatory House. 
Month. 
£ 
c 3 
Q 
No. of 
Observations. 
Morning or 
Evening. 
Time. 
Height of 
Number of 
Wind. 
Weather. 
Barom. 
Therm. 
Hygrom. 
Beats. 
j Seconds. 
1820. 
h. 
Inches. 
O 
Dry. 
II 
July 
16 
I 
E 
8 
29,875 
82,4 
16 
31,0 
12,4 
SE 
Cloudy. 
i? 
I 
- 
8 
29,830 
83,2 
H 
31 
12,4 
SE 
Hazy. 
18 
I 
M 
3 
29,845 
79 > 8 
IO 
3 ? 
13,2 
NW 
Cloudy. 
I 
E 
8 
29,848 
B 3>9 
IO 
31 
12,4 
Light SE 
Clear. 
l 9 
I 
M 
5 
29,870 
79 , 8 
I 2 
32 
12,8 
Light NE 
Cloudy, and rain. 
I 
E 
8 
29,875 
82,5 
>3 
30 
12,0 
SE 
Clear. 
20 
I 
E 
8 
29,878 
83,0 
14 
3 ° 
] 2,0 
SE 
Ditto. 
21 
I 
E 
8 
29,900 
82,0 
14 
3 i 
12,4 
SE 
Cloudy. 
22 
I 
M 
3 
29,920 
80,0 
12 
3 i 
12,4 
W 
Ditto. 
I 
E 
8 
29,925 
80,4 
15 
3 ° 
12,0 
Calm 
Ditto. 
2 3 
I 
M 
5 
29,920 
80,5 
14 
3 i 
12,4 
Land or W 
Ditto. 
I 
E 
8 
29,926 
82,0 
15 
3 i 
12,4 
Calm 
Ditto. 
z 4 
I 
M 
3 
29,920 
80,0 
H 
3i 
12,4 
W 
Hazy. 
I 
E 
8 
30,000 
82,8 
15 
3 ° 
12,0 
SE 
Rain. 
2 5 
I 
M 
5 
2 9-955 
80,2 
H 
32 
12,8 
Land 
Cloudy. 
I 
E 
8 
29,988 
84,0 
19 
3 i 
12,4 
SE 
Ditto. 
26 
i 
M 
5 
30,045 
80,0 
l6 
3 i 
12,4 
Light land 
Hazy. 
I 
E 
8 
30,040 
85,0 
20 
3 i 
12,4 
W 
Cloudy. 
2 7 
1 
M 
3 
30,050 
82,2 
20 
3o 
12,0 
W 
Hazy. 
I 
E 
8 
3°’°55 
83,0 
•9 
30 
12 
SE 
Thin haze. 
28 
I 
M 
5 
3°-°5 3 
80,7 
15 
3 i 
12,4 
W 
Cloudy. 
I 
E 
8 
50,025 
81,0 
9 
30 
12,0 
Calm 
Ditto. 
29 
1 
M 
3 
30,020 
79,8 
9 
32 
I 2,8 
SE 
Variable. 
I 
E 
8 
30,022 
79,8 
7 
3 i 
iz,4 
SE 
Cloudy. 
30 
I 
M 
3 
30,040 
77,8 
7 
30 
12,0 
W 
Clear. 
I 
E 
8 
30,008 
83,0 
7 
29 
1 1,6 
Fresh SE 
Very clear. 
3 1 
I 
M 
5 
30,025 
81,0 
8 
3 ° 
12,0 
Light SW 
Clear. 
I 
E 
8 
30,000 
81,7 
10 
3 ° 
12,0 
SSE 
Cloudy. 
Aug. 
1 
I 
E 
8 
30,015 
82,0 
7 
30 
12,0 
Light SE 
Clear. 
2 
I 
E 
8 
30,000 
81,0 
5 
3° 
12,0 
Calm 
Cloudy. 
3 
I 
M 
5 
30,020 
80,2 
4 
3° 
12,0 
W 
Ditto. 
I 
E 
8 
30,025 
82,5 
6 
29 
I 1,6 
SE 
Clear. 
4 
I 
- 
8 
3°, OI 5 
81,5 
8 
3 ° 
12,0 
SE 
Ditto. 
5 
I 
M 
5 
30,030 
80,0 
7 
29 
1 1,6 
Calm 
Cloudy. 
I 
E 
8 
29-97 5 
82,0 
7 
29 
T 1,6 
SE 
Clear. 
6 
I 
- 
8 
29,965 
82,5 
6 
31 
12,4 
SW 
Cloudy. 
7 
1 
M 
3 
30,000 
80,5 
9 
3° 
12,0 
Land 
Ditto. 
I 
E 
8 
30,01 5 
81,0 
8 
3° 
12,0 
Calm 
Ditto. 
8 
2 
M 
5 
30,01 5 
8oj 2 
9 
3 i ,5 
12,6 
W 
Ditto. 
2 
E 
8 
29,945 
81,0 
10 
3 i 
12,4 
W 
Cloudy, and lightning. 
9 
I 
M 
5 
29-95 5 
79 > 8 
9 
32 
12,8 
W 
Cloudy. 
2 
E 
8 
29,955 
82,0 
10 
32 
12,8 
Fresh W 
Cloudy, and thunder. 
1 1 
2 
M 
5 
30,000 
80,6 
8 
30,5 
12,2 
Light SW 
Hazy. 
2 
E 
8 
29,965 
84,0 
9 
3°,° 
12,0 
SE 
Ditto, and lightning. 
12 
2 
M 
5 
29,978 
81,2 
5 
3 1 - 0 
12,4 
W 
Clear, and distant lightning. 
2 
E 
8 
29,945 
83,3 
8 
30,0 
12,0 
SE 
Hazy, and distant lightning. 
13 
2 
M 
5 
30,000 
81,4 
7 
30,5 
12,2 
Calm 
Cloudy, and ditto. 
MDCCCXXIII. S 
