104 
MR. LUBBOCK ON THE TIDES. 
the tide rises 6 3 inches, and hence the I'angeoi the correction here is about 21 inches. 
Hence it is evident that in many inquiries relative to the tides, and particularly when 
observations are employed throughout only a limited period, the correction due to 
the atmospheric pressure may require to be attended to. Here, however, a question 
arises of some interest ; does the surface of the ocean rise in narrow seas simulta- 
neously with the depression of the barometer, or otherwise ? In order to acquire some 
information upon this point, I requested Mr. Russell to calculate carefully from our 
Tables the height of high water at Liverpool and London for May and June 1836, 
and to compare the calculations with the observations, which is done in the accom- 
panying Table, and the errors, together with the height of the barometer at Liverpool 
and London, are exhibited in fig. 3. Plate V. 
Table showing the difference between the Height of High Water as calculated, and 
the Heights derived from observations at the London and Liverpool Docks. 
1836. 
May. 
Liverpool. 
London. 
1836. 
May. 
Liverpool. 
London. 
1836. 
June. 
Liverpool. 
London. 
J836. 
June. 
Liverpool. 
London. 
O - 
c. 
O- 
c. 
O- 
c. 
O- 
c. 
O - 
c. 
O- 
c. 
O - 
C. 
O- 
c. 
inches. 
inches. 
inches. 
inches. 
inches. 
inches. 
inches. 
inches. 
i 
— 
1 
— 
1 
17 
+ 
1 
1. 
+ 
6 
17. 
+ 
11 
+ 
9 
— 
7 
+ 
5 
— 
8 
0 
— 
3 
+ 
4 
+ 
12 
+ 
9 
2 
— 
11 
+ 
13 
18 
— 
6 
— 
1 
2. 
0 
+ 
6 
18. 
+ 
14 
+ 
5 
+ 
18 
— 
4 
+ 
1 
+ 
6 
+ 
6 
+ 
14 
+ 
5 
3 
— 
15 
+ 
11 
19 
— 
3 
+ 
1 
3. 
+ 
11 
+ 
1 
19. 
+ 
14 
+ 
7 
— 
11 
+ 
8 
— 
1 
— 
1 
+ 
14 
+ 
1 
+ 
13 
+ 
10 
4 
— 
6 
+ 
6 
20 
+ 
1 
— 
1 
4. 
+ 
17 
+ 
4 
20. 
+ 
12 
+ 
8 
— 
2 
+ 
5 
+ 
2 
+ 
1 
+ 
18 
+ 
4 
+- 
12 
+ 
5 
5 
— ■ 
1 
+ 
2 
21 
+ 
3 
+ 
4 
5. 
+ 
14 
+ 
8 
21. 
+ 
11 
+ 
5 
— 
4 
+ 
5 
+ 
3 
+ 
5 
+ 
12 
+ 
10 
+ 
4 
6 
— 
5 
+ 
7 
22 
+ 
4 
+ 
2 
6. 
+ 
12 
+ 
17 
22. 
+ 
12 
0 
— 
3 
+ 
5 
+ 
1 
+ 
1 
+ 
5 
+ 
6 
+ 
14 
0 
7 
— 
4 
+ 
6 
23 
0 
+ 
5 
7. 
+ 
12 
+ 
6 
23. 
+ 
16 
+ 
1 
— 
2 
+ 
4 
— 
3 
+ 
7 
+ 
9 
+ 
8 
+ 
15 
+ 
2 
8 
— 
2 
+ 
4 
24 
— 
1 
+ 
6 
8. 
+ 
6 
+ 
7 
24. 
+ 
11 
+ 
2 
0 
+ 
3 
+ 
1 
0 
+ 
9 
+ 
6 
+ 
10 
+ 
1 
9 
+ 
1 
+ 
4 
25 
+ 
1 
0 
9. 
+ 
9 
+ 
6 
25. 
+ 
9 
0 
0 
+ 
2 
— 
3 
+ 
1 
+ 
9 
+ 
4 
+ 
4 
+ 
1 
10 
0 
+ 
1 
26 
— 
2 
+ 
5 
10. 
+ 
9 
+ 
3 
26. 
0 
+ 
3 
— 
1 
— 
3 
— 
2 
+ 
1 
T 
5 
+ 
5 
— 
2 
+ 
2 
11 
0 
— 
5 
27 
— 
2 
1 
11. 
+ 
3 
27. 
— 
1 
0 
— 
5 
— 
2 
— 
1 
+ 
5 
+ 
6 
+ 
2 
+ 
1 
12 
0 
28 
— 
0 
12. 
+ 
5 
+ 
4 
28. 
+ 
3 
0 
— 
3 
+ 
1 
— 
2 
0 
+ 
3 
+ 
2 
+ 
2 
+ 
2 
13 
— 
5 
0 
29 
— 
3 
0 
13. 
+ 
1 
+ 
3 
29. 
0 
+ 
3 
— 
8 
— 
2 
— 
3 
+ 
1 
+ 
1 
+ 
4 
0 
+ 
3 
14 
— 
9 
— 
2 
30 
— 
2 
0 
14. 
+ 
4 
+ 
5 
30. 
+ 
3 
— 
9 
— 
1 
— 
3 
+ 
1 
+ 
5 
+ 
7 
— 
1 
+ 
2 
15 
— 
9 
— 
1 
31 
— 
0 
+ 
3 
15. 
+ 
7 
+ 
9 
— 
7 
— 
1 
— 
3 
+ 
2 
+ 
11 
16 
— 
7 
0 
16. 
+ 
11 
+ 
10 
— 
7 
+ 
1 
+ 
11 
+ 
9 
The above differences, O — C, are not the differences between Calculation and actual 
observation, but between Calculation and what it is presumed observation would be 
if freed of diurnal inequality by drawing an intermediate curve between those given 
in Plate TV. 
