made with an invariable pendulum. 
241 
Experiment No. III. at San Bias, in Mexico. 
First Series. By Captain Hall. 
Comparison of Chronometer 438 with clock at San Bias, (lstseries.) 
Date. 
Chronometer. 
Clock. 
Difference. 
1822, 
h. 
m. 
s. 
h. 
m. 
s. 
h. 
m. 
s. 
Noon, May 14th, 
4 
16 
45,5 
11 
25 
0 
7 
8 
14,50 
P. M. 
11 
45 
50,0 
6 
54 
0 
10,00 
0 
26 
5 °,5 
7 
35 
0 
9 , 5 ° 
0 
47 
51,0 
7 5 ° 
0 
9,00 
1 
28 
51,2 
8 
37 
0 
8,80 
1 
57 
5 i -5 
9 
6 
0 
8,50 
2 
23 
51,7 
9 
32 
0 
8,30 
Noon, 15 th, 
4 
0 58,5 
11 
18 
0 
7 
8 
1,50 
P. M. 
11 
27 
2,5 
6 
35 
0 
7 57 , 5 ° 
1 1 
42 
2,8 
6 
5 ° 
0 
57,20 
0 
23 
3 >° 
7 
31 
0 
57,00 
0 
48 
3,4 
7 5 6 
0 
56,60 
1 
27 
3,7 
8 
35 
0 
56,30 
1 
5 6 
3>9 
9 
4 
0 
56,10 
2 
22 
4 A 
9 
3 ° 
0 
55 , 9 ° 
Noon, 16th May, 
4 
8 
10, 0 
1 1 
16 
0 
7 
7 
0 
0 
0 
P.M. 
1 1 
36 15, 0 
6 
44 
0 
45,00 
0 
22 
! 5 > 5 
7 
3 ° 
0 
44,50 
0 
44 
• 5 > 7 
7 
52 
0 
44,30 
1 
20 
16, 0 
8 
28 
0 
44,00 
1 
55 
16, 2 
9 
3 
0 
43,80 
2 
H 
16, 5 
9 
22 
0 
43,50 
Noon, 17th, 
4 
6 
2 4 » 5 
11 
H 
0 
7 
7 
35,50 
P.M. 
1 1 
32 
31, 8 
6 
40 
0 
28,20 
0 
13 
32, 3 
7 
21 
0 
27,70 
0 
37 
32, 5 
7 
45 
0 
27,50 
1 
17 
33, 0 
8 
25 
0 
27,00 
1 
47 
33 » 5 
8 
55 
0 
26,50 
2 
10 
33 , 7 
9 
18 
0 
26,30 
Noon, 18th, 
4 
8 
41, 8 
1 1 
16 
0 
7 
7 
18,20 
P.M. 
11 
28 
47 , 4 
6 36 
0 
12,60 
0 
9 47 , 8 
7 
>7 
0 
12,20 
0 
3 i 
48, 0 
7 
39 
0 
12,00 
1 
1 1 
48, 5 
8 
19 
0 
11,50 
1 
42 48, 8 
8 
5 ° 
0 
I 1,20 
2 
5 
49, 0 
9 
13 
0 
11,00 
Noon, 19th, 
4 
6 
57 , 0 
1 1 
14 
0 
7 
7 
3,00 
P. M. 
1 1 
24 
1, 0 
6 
3 * 
0 
6 
59,00 
0 
5 
i> 3 
7 
12 
0 
58,70 
0 
27 
5 
7 
34 
0 
58,50 
1 
9 
2, 0 
8 
16 
0 
58,00 
1 
46 
2, 3 
8 
53 
0 
57,70 
2 
1 
2,50 
9 
8 
0 
57,50 
Noon, zoth. 
4 
6 
9 » 7 
11 
13 
0 
7 
6 
50,30 
MDCCCXXIII. 
Ii 
