692 
APPENDIX. 
TABLE V. 
SHOWING THE HORARY OSCILLATION OF THE BAROMETER BETWEEN THE TROPICS OF 
CANCER AND CAPRICORN. 
This is an abstract of the preceding Table, and shows the amount of the periodical oscil- 
lation of the atmospherical column at the under-mentioned hours, as well as the mean 
altitude of the barometer at each parallel. From the difficulty of registering the barometer 
on board a ship at sea, these results are inseparable from discrepancies ; but the averages are 
on the whole satisfactory, and rather show an increase of the atmospherical tides towards 
the equator. The results are the differences from the mean altitude of the barometer for 
each parallel. 
NORTH ATLANTIC. 
Latitude. 
A.M. 
P.M. 
Vib. of 
Column. 
Mean alt. 
of 
Barometer 
3 
C 
9 
Noon. 
3 
6 
9 
Midnight. 
25 ° to 20“ 
20 — 15 
15 — 10 
10— 5 
5— 0 
-038 
-i-004 
-029 
-005 
-035 
-008 
4-029 
-001 
4-004 
-014 
-028 
—021 
4-037 
4-054 
4-032 
-001 
-057 
-013 
-037 
-007 
—016 
4-019 
4-017 
4-038 
-005 
4-016 
4-008 
-007 
-009 
4-004 
.054 
.050 
.066 
.091 
.067 
30.139 
30.121 
.084 
.063 
.033 
Mean 
-021 
4-008 
4-015 
-023 
4-011 
4-002 
.038 
.30.085 
SOUTH ATLANTIC. 
Latitude. 
A.M. 
P.M. 
Vib. of 
Column. 
Mean alt* 
of 
Barometer 
3 
6 
9 
Noon. 
3 
6 
9 
Midnight. 
0“ to 5 ° 
5 — 18 
10—15 
15 — 20 
20 — 23 
-026 
-1-006 
-073 
-038 
-024 
• • 
4-005 
056 
034 
029 
028 
-004 
4-006 
016 
002 
Oil 
-054 
-109 
4-037 
—013 
-046 
• • 
4-032 
Oil 
002 
032 
015 
4-046 
4-031 
-003 
4-002 
4-018 
.100 
.169 
.113 
.070 
.074 
30.051 
.104 
.143 
.163 
.152 
Mean 
-031 
• • 
4-030 
4-006 
-037 
- • 
4-018 
4-019 
.067 
30.123 
Mean of 
NorthAtl. / 
-021 
• • 
H-008 
4-015 
-023 
• • 
4-011 
4-002 
.038 
30.085 
Mn. of both 
-026 
• • 
4-019 
4-011 
-030 
• • 
4-014 
4-011 
.049 
30.104 
