260 
MR. LUBBOCK ON THE TIDES 
Table XXXI. (Continued.) 
Moon’s 
Transit. 
18° Declination. 
21° Declination. 
Moon’s 
Transit. 
Sun’s 
Decli- 
nation. 
d ■p 
Ah 
Sun’s 
Decli- 
nation. 
d p 
Ah 
Theory. 
Obser- 
vation . 
Theory. 
Obser- 
vation. 
Theory. 
Obser- 
vation. 
Theory. 
Obser- 
vation. 
h m 
m 
m 
feet. 
feet. 
m 
m 
feet. 
feet. 
h m 
0 30 
18-9 
0 
- 3 
-•20 
-•09 
19-4 
0 
- 2 
-•38 
-•24 
0 30 
1 30 
17-8 
- 1 
0 
-•19 
-•29 
18-4 
- i 
- 4 
-■34 
-•09 
1 30 
2 30 
15-7 
- 1 
- 1 
-•14 
-•14 
15-3 
- 2 
- 6 
-•28 
-•19 
2 30 
3 30 
13-2 
- 1 
- 2 
-•12 
-•01 
12-8 
- 2 
- 6 
-•26 
-•22 
3 30 
4 30 
11-8 
- 3 
- 3 
-•14 
-•21 
11-6 
- 5 
- 8 
-•38 
-•49 
4 30 
5 30 
11-5 
- 2 
- 2 
-•16 
-•22 
11-0 
- 4 
-10 
-•32 
-•38 
5 30 
6 30 
11-3 
0 
+ 3 
-•17 
-•09 
1M 
0 
+ 3 
-•34 
-•31 
6 30 
7 30 
12-3 
+ 2 
+ 3 
-•16 
-•16 
11-5 
+ 4 
+ 4 
-•31 
-•39 
7 30 
8 30 
13-5 
+ 2 
+ 2 
-•13 
-•12 
130 
+ 5 
+ 1 
-•28 
-•24 
8 30 
9 30 
150 
+ 1 
+ 3 
-•13 
-•21 
15-4 
+ 2 
+ 2 
-•27 
-•31 
9 30 
10 30 
18-1 
0 
- 0 
-•17 
+•02 
18-0 
+ 1 
- 2 
-•32 
-•20 
10 30 
11 30 
19-1 
+ 1 
- 5 
-•21 
-•10 
19-9 
0 
- 3 
-•38 
-•21 
11 30 
24° Declination. 
27° Declination. 
0 30 
21-0 
0 
- 4 
-•58 
-•37 
22-3 
0 
- 7 
-•79 
- -34 
0 30 
1 30 
19-3 
- 2 
- 7 
-•54 
-•26 
21-0 
- 1 
- 5 
-•77 
- -68 
1 30 
2 30 
16-4 
- 3 
- 5 
-•46 
-•34 
17-8 
- 3 
-10 
-•67 
- -55 
2 30 
3 30 
13-0 
- 4 
- 9 
-■44 
-•24 
13-9 
- 6 
-15 
-•62 
- -57 
3 30 
4 30 
10-5 
- 7 
-12 
-•44 
-•63 
9-2 
-11 
-17 
-•61 
- -84 
4 30 
5 30 
9-8 
- 6 
-13 
-•50 
-•37 
6-4 
-10 
-21 
-•70 
-1-01 
5 30 
6 30 
9-4 
0 
- 1 
-•54 
-•50 
6-6 
0 
- 4 
-•75 
- -79 
6 30 
7 30 
10-7 
+ 6 
+ 4 
-•49 
-•41 
8-7 
+ 9 
+ 3 
-•67 
- -76 
7 30 
8 30 
13-0 
+ 7 
+ 2 
-•44 
-•45 
13-8 
+ 9 
+ 5 
-•61 
- -49 
8 30 
9 30 
16-2 
+ 4 
+ 1 
-•44 
-•48 
18-0 
+ 4 
+ 4 
-•64 
- -60 
9 30 
10 30 
19-3 
+ 2 
- 3 
-•50 
-•30 
20-7 
+ 2 
- 2 
-•71 
- -45 
10 30 
11 30 
21-0 
+ 1 
- 5 
-•58 
-•46 
22-2 
+ 1 
- 5 
-•79 
- -46 
11 30 
Table XXXII. 
Showing a Comparison between the Diurnal Inequality in the Interval, as deduced 
from theory and observation. 
The numbers in the column headed “ Theory” have been calculated by Mr. Russell 
from the expression for d ^ in p. 223, making the constant F = 10. 
Observation and theory agree in this respect, that there is no difference between 
the diurnal inequality for the upper and lower transits, and that it recurs after six 
months with a contrary sign. I deduced the numbers in the column headed u Ob- 
servation” upon these suppositions from those given in Table XXL before I had seen 
Mr. Russell's calculations. The agreement is satisfactory with the expression de- 
rived from the equilibrium-theory ; but in order to ascertain clearly the law of the 
diurnal inequality, I think it would be desirable to employ a greater number of oh 
servations. 
Moon’s 
Transit. 
P.M. 
January. 
February. 
March. 
April. 
May. 
June. 
Moon’s 
Transit. 
P.M. 
Observa- 
tion. 
Theory. 
Observa- 
tion. 
Theory. 
Observa- 
tion. 
Theory. 
Observa- 
tion. 
Theory. 
Observa- 
tion. 
Theory. 
Observa- 
tion. 
Theory. 
h m 
m 
m 
m 
m 
m 
m 
m 
ID 
m 
m 
m 
m 
h m 
0 30 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 30 
1 30 
+ 1 
+ 1 
+ 1 
0 
0 
0 
0 
0 
0 
- i 
0 
- i 
1 30 
2 30 
+ 3 
■+• 1 
+ 3 
0 
+ i 
0 
0 
- 1 
- 1 
- 2 
- 2 
- 2 
2 30 
3 30 
+ 3 
+ 2 
+ 3 
0 
+ i 
- 1 
- 1 
- 2 
- 1 
- 3 
- 3 
- 3 
3 30 
4 30 
+ 4 
+ 2 
+ 3 
0 
+ i 
- 1 
- 1 
- 3 
- 2 
- 4 
- 4 
- 3 
4 30 
5 30 
+ 5 
+ 3 
+ 4 
+ 1 
+ i 
- 1 
- 2 
- 4 
- 4 
- 5 
- 5 
- 4 
5 30 
6 30 
+ 5 
+ 4 
+ 4 
+ 3 
+ 1 
0 
- 2 
- 3 
- 5 
- 4 
- 6 
— 4 
6 30 
7 30 
+ 4 
+ 5 
+ 3 
+ 4 
+ 0 
+ 2 
- 2 
- 1 
- 5 
- 3 
- 5 
- 4 
7 30 
8 30 
+ 4 
+ 4 
+ 3 
+ 3 
+ 1 
+ 2 
- 2 
0 
- 4 
- 2 
- 4 
- 3 
8 30 
9 30 
+ 5 
+ 3 
+ 3 
+ 2 
+ 1 
+ 1 
- 1 
0 
- 3 
- 2 
- 3 
- 3 
o 
9 30 
in *?n 
