ATMOSPHERE ON THE MEAN LEVEL OF THE OCEAN 
293 
Table A. 
Table B. 
Date. 
1848. 
Observed 
level. 
Observed 
Barom. 
ft. 
in. 
inches. 
Nov. 1 
20 
9-9 
30101 
2 
21 
4-4 
29-683 
3 
21 
8-3 
29-351 
4 
21 
3-5 
29-643 
5. 
20 
9-7 
30168 
6. 
20 
8-1 
30-270 
7. 
20 
9-2 
30123 
8. 
21 
0-4 
29-756 
9. 
21 
0-4 
29-706 
10. 
21 
0-7 
29-759 
11. 
20 
100 
29-894 
12. 
20 
11-7 
30-064 
13. 
20 
6-4 
30-225 
14. 
20 
11-2 
30047 
15. 
20 
10-7 
30-185 
16. 
21 
1-0 
29-957 
17. 
21 
2-1 
29-727 
18. 
21 
1-2 
29-780 
19. 
21 
0-2 
29-753 
20. 
21 
0-5 
29-703 
21. 
20 
9-8 
29-847 
22. 
21 
2-3 
29-953 
23. 
20 
11-2 
29-937 
24. 
21 
0-2 
29-896 
25. 
21 
00 
29-889 
26. 
21 
1-3 
29-936 
27. 
21 
05 
29-830 
28. 
20 
11-6 
29-773 
29. 
21 
1-5 
29-733 
30. 
21 
1-1 
29-903 
Dec. 1. 
21 
1-9 
29-957 
2. 
21 
1-2 
30-002 
3. 
21 
1-5 
29-938 
4. 
21 
1-3 
29-843 
5. 
20 
10-6 
29-792 
6 
20 
8-1 
30-001 
7. 
20 
7-7 
30-121 
8. 
20 
11-9 
29-903 
9. 
21 
2-0 
29-766 
10. 
20 
10-6 
29-905 
11. 
20 
11-0 
29-879 
12. 
20 
11-6 
29-887 
13. 
21 
1-0 
29-887 
14. 
21 
3-6 
29-790 
15. 
21 
4-5 
29-718 
16. 
21 
2-4 
29-837 
17. 
20 
10-7 
30-052 
Date. 
1848. 
Observed 
Barom. 
Observec 
level. 
Correc- 
tions. 
True 
level. 
Remarks. 
inches. 
ft. 
in. 
inches. 
ft. 
in. 
inches. 
Nov. 
6 
30-270 
20 
8-1 
+5-24 
21 
1-34 
1 Barom 
..30-227 
Nov. 
13 
30-225 
20 
6-4 
+4-64 
20 
11-04 
ft. in. 
Nov. 
15 
30-185 
20 
10 7 
+411 
21 
2-81 
J Level 
..20 8-4 
Nov. 
5 
30-168 
20 
9-7 
Correction . 
.. +4-66 
Nov. 
7. 
30-123 
20 
9-2 
3-19 
Corrected level... 21 1-06 
Dec. 
7. 
30-121 
20 
7-7 
Mean ... 
21 
106 
Nov. 
1. 
30-101 
20 
9*9 
Nov. 
12. 
30064 
20 
11-7 
Dec. 
17. 
30052 
20 
10-7 
Nov. 
14. 
30-047 
20 
1 1-2 
Dec. 
2. 
30-002 
21 
1-2 
Dec. 
6. 
30-001 
20 
8-1 
Nov. 
16. 
29-957 
21 
1-0 
Dec. 
1. 
29-957 
21 
1-9 
Nov. 
22. 
29-953 
21 
2-3 
Dec. 
3. 
29-938 
21 
15 
Nov. 
23. 
29-937 
20 
1 1-2 
Nov. 
26. 
29-936 
21 
1-3 
Dec. 
10. 
29-905 
20 
10-6 
Nov. 
30. 
29-903 
21 
1-1 
Dec. 
8. 
29-903 
20 
11-9 
Nov. 
24. 
29-896 
21 
0-2 
Nov. 
11. 
29-894 
20 
10-0 
Nov. 
25. 
29-889 
21 
00 
Dec. 
12. 
29-887 
20 
116 
inches. 
Dec. 
13. 
29-887 
21 
1-0 
Barom. ...... 
...29-867 
Dec. 
11. 
29-879 
20 
11-0 
> 
ft. in. 
Nov. 
21. 
29-847 
20 
9-8 
Level.......... 
.21 0-16 
Dec. 
4. 
29-843 
21 
1-3 
Dec. 
16. 
29-837 
21 
2-4 
Nov. 
27. 
29-830 
21 
0-5 
Dec. 
5. 
29-792 
20 
10-6 
Dec. 
14. 
29-790 
21 
3 6 
Nov. 
18. 
29-780 
21 
1-2 
Nov. 
28. 
29-773 
20 
11-6 
Dec. 
9. 
29-766 
21 
2-0 
Nov. 
10. 
29-759 
21 
0-7 
Nov. 
8. 
29-756 
21 
0-4 
Nov. 
19. 
29-753 
21 
0-2 
Nov. 
29. 
29-733 
21 
1-5 
Nov. 
17. 
29-727 
21 
2-1 
Dec. 
15. 
29-718 
21 
4-5 
Nov. 
9. 
29-706 
21 
0-4 
Nov. 
20. 
29-703 
21 
0-5 
inches. 
Nov. 
2. 
29-683 
21 
4-4 
-2-53 
21 
1-87 
1 Barom 
..20-559 
1 
ft. in. 
Nov. 
4. 
29-643 
21 
3-5 
-305 
21 
0-45 
f Level 
.21 5-4 
Nov. 
3. 
29-351 
21 
8-3 
-702 
21 
1-28 
J Correction .. 
. -4-17 
Mean 
29-874 
21 
0-21 
■60 
Corrected level. 
21 1-23 
Mean ... 
21 
1-2 
The result of these forty-seven days of hourly observations gives for the mean 
height of the barometer 29 - 874 inches, and the mark of the mean level of the ocean 
21 feet 0'21 inch. 
In order to avoid the effects of accidental irregularities, the means of the three 
days of greatest and of least pressure are taken to compare with the mean level of 
