244 
MR. LUBBOCK ON THE TIDES. 
Table XVIII. 
Showing the Difference in the Height of High Water at the London Docks, and the 
Height corresponding to fifteen degrees Declination, for every three degrees of the 
Moon’s Declination north or south. 
Moon’s 
Transit. 
0° Dec!. 
3° Decl. 
6° Decl. 
9° Decl. 
12° Decl. 
15° Decl. 
18° Decl. 
21° Decl. 
24° Decl. 
27° Decl. 
Moon’s 
Transit. 
h m 
feet. 
feet. 
feet. 
feet. 
feet. 
feet. 
feet. 
feet. 
feet. 
feet. 
h m 
0 30 
+ 0-06 
+ 0-16 
+ 0-19 
+ 0-02 
+ 0-09 
0 
— 
0-09 
- 0-24 
- 0-37 
- 0-34 
0 30 
1 30 
+ 0-02 
+ 0-26 
+ 0-17 
+ 0-07 
+ 0-01 
0 
— 
0-29 
- 0-09 
- 0-26 
- 0-68 
1 30 
2 30 
+ 0-08 
+ 0-01 
+ 0-17 
- 0-04 
+ 0-07 
0 
— 
014 
- 0-19 
- 0-34 
- 0-55 
2 30 
3 30 
+ 0-35 
+ 0-28 
+ 0-39 
+ 0-17 
+ 015 
0 
— 
0-01 
- 0-22 
- 0-24 
- 0-57 
3 30 
4 30 
+ 0-14 
+ 0-38 
4- 0-23 
+ 0-41 
- 001 
0 
— 
0-21 
- 0-49 
- 0-63 
- 0-84 
4 30 
5 30 
+ 0-35 
+ 0-27 
+ 0-44 
+ 0-56 
+ 0-14 
0 
— 
0-22 
- 0-38 
- 0-37 
- 1-01 
5 30 
6 30 
+ 0-46 
+ 0-55 
+ 0-39 
+ 0-31 
+ 0-20 
0 
— 
009 
- 0-31 
- 050 
- 0-79 
6 30 
7 30 
+ 0-05 
+ 0-28 
+ 0-25 
+ 0-26 
0-00 
0 
— 
0-16 
— 0-39 
- 0-41 
- 0-76 
7 30 
8 30 
+ 0-37 
+ 0-19 
+ 0-17 
+ 0-16 
+ 0-11 
0 
— 
0-12 
- 0-24 
- 0-45 
- 0-49 
8 30 
9 30 
+ 0-23 
+ 0-37 
+ 0-13 
+ 0-14 
0-00 
0 
— 
0-21 
- 0-31 
- 0-48 
- 0-60 
9 30 
10 30 
+ 0-34 
+ 0-29 
+ 0-21 
+ 0-16 
+ 0-12 
0 
+ 
002 
- 0-20 
- 0-30 
- 0-45 
10 30 
11 30 
+ 0-37 
+ 0-34 
+ 0-09 
+ 0-03 
- 0-05 
0 
0-10 
- 0-21 
- 0-46 
- 0-46 
11 30 
Table XIX. 
Showing the Difference in the Height of High Water at the London Docks when the 
Moon’s Declination is north or south. 
Moon’s 
Transit. 
6° Declination. 
21° Declination. 
North. 
South. 
Difference. 
North. 
South. 
Difference. 
h 
m 
feet. 
feet. 
feet. 
feet. 
feet. 
feet. 
0 
30 
+ 
•13 
+ 
•11 
— 
•02 
- -28 
+ 
•04 
+ 
•32 
1 
30 
+ 
•19 
+ 
•14 
— 
•05 
- -21 
•22 
•01 
2 
30 
•05 
+ 
•14 
+ 
•19 
- -21 
— 
•24 
— 
•03 
3 
30 
+ 
•21 
+ 
•34 
+ 
•13 
- -18 
— 
•13 
+ 
•05 
4 
30 
+ 
•13 
+ 
•34 
+ 
•21 
- -49 
— 
•40 
+ 
•09 
5 
30 
+ 
•35 
+ 
•49 
+ 
•14 
- -29 
— 
•35 
•06 
6 
30 
+ 
•44 
+ 
•39 
•05 
- -27 
— 
•33 
— 
•06 
7 
30 
+ 
•31 
+ 
•22 
— 
•09 
- -32 
— 
•31 
+ 
•01 
8 
30 
+ 
•11 
+ 
•22 
+ 
•12 
- -20 
— 
•33 
•13 
9 
30 
+ 
•21 
+ 
•22 
+ 
•01 
- -27 
— 
•39 
— 
•12 
10 
30 
+ 
•25 
+ 
•19 
•06 
- -05 
— 
•27 
— 
•22 
11 
30 
+ 
•10 
+ 
•20 
+ 
•10 
- -18 
— 
•34 
— 
•16 
The preceding Table has been formed by considering the quantities given for 6° 
and 21° as arithmetic means between those given in Table XVII. for 3°, 6°, 9°, and 
18°, 21°, and 24°, so that they may each be considered as resulting from the average 
of about 150 observations. This Table does not seem to confirm what is stated by 
Laplace, Mec. Cel. tom. v. p. 162. “ L’action de la lune pour elever la mer a Brest, 
est plus grande lorsque sa declinaison est australe, que lorsqu’elle est boreale.” 
