made with an invariable pendulum. 
261 
Experiment No. V. at Rio de Janeiro. 
1st Series. By Captain Hall. 
Comparisons of Clock with Chronometer 438 at Rio de Janeiro. 
Dater 
Barom. 
Therm. 
Chronometer. 
Clock. 
Difference. 
1822. 
Inches. 
O 
h. m. s. 
h. m. s. 
Clock Fast, 
m. s. 
Sept. 28 Noon. 
29,86 
72 
II 19 50,00 
1 1 49 0,0 
29 10,00 
29 
P. M. 
29,92 
73 
II 13 10,00 
5 8 15,00 
6 35 16, 0 
1 1 42 0,0 
5 37 0,0 
7 4 
28 50,00 
28 45, 0 
28 44, O 
3 ° 
P. M. 
29,88 
74 
11 24 29, 5 
4 55 34 > 5 
6 7 35 > 5 
11 53 0,0 
5 24 0,0 
6 36 0,0 
28 30, 5 
28 25, 5 
28 24, 5 
Oct. 1. 
P. M. 
29,81 
74 ! 
11 30 51, 5 
6 39 58, 5 
7 4 1 59 > 5 
12 9 0,0 
7 8 0,0 
8 10 0,0 
28 8, 5 
28 1, 5 
28 0, 5 
2 
29,82 
75 
11 16 14, 5 
1 1 44 0,0 
27 45, 0 
4 
30,00 
7 ! >9 
11 8 53, 5 
1136 0,0 
27 6, 5 
5 
P. M. 
29,90 
71,90 
11 9 12, 5 
5 20 » 7 > 5 
5 47 18, 0 
7 36 i 9 > 5 
1 1 36 0,0 
5 47 °>° 
6 14 0,0 
8 3 0,0 
26 47, 5 
26 42, 5 
26 42, 0 
26 40, 5 
