MR. LUBBOCK ON THE TIDES. 
131 
Table XXII. ( h .) 
Showing a Comparison between the Semimenstrual Inequality at London in the 
Interval and in the Height, as deduced from theory and from the results of 
observation contained in Tables XVI. and XVII. 
Moon’s Hor. Par. 57 f , and Decl. 15°. 
Apparent 
Solar Time 
of Moon’s 
Transit 
B. 
Interval. 
+ a constant. 
Height. 
h . 
Theory. 
Observation. 
Theory. 
Observation . 
h 
m 
h 
m 
h 
m 
feet. 
feet. 
0 
0 
3 
15-3 
22-76 
0 
30 
3 
71 
3 
7-1 
22-77 
22-72 
1 
0 
2 
58-8 
22-70 
1 
30 
2 
51-3 
2 
50'9 
22-58 
22-44 
2 
0 
2 
431 
22-35 
2 
30 
2 
36-8 
2 
36-5 
22-09 
21-92 
3 
0 
2 
30-8 
21-73 
3 
30 
2 
26-8 
2 
26-7 
21-35 
21-14 
4 
0 
2 
24-8 
20-90 
4 
30 
2 
23-3 
2 
24-0 
20-47 
20-23 
5 
0 
2 
29-8 
20-10 
5 
30 
2 
37-8 
2 
37’5 
19-75 
19-57 
6 
0 
2 
52-8 
19-58 
6 
30 
3 
10-8 
3 
10-8 
19-47 
19-55 
7 
0 
3 
25-8 
19-64 
7 
30 
3 
42-8 
3 
41-5 
19-85 
20-26 
8 
0 
3 
48-8 
20-25 
8 
30 
3 
53-8 
3 
53-4 
20-63 
21-15 
9 
0 
3 
51-8 
21-10 
9 
30 
3 
49-8 
3 
50-4 
21-50 
21-89 
10 
0 
3 
44-8 
21-89 
10 
30 
3 
38-8 
3 
39-0 
22-22 
22-42 
11 
0 
3 
30-8 
22-47 
11 
30 
3 
23-8 
3 
23-6 
22-66 
22-70 
The above Inequalities from theory are the same as for the preceding London Dis- 
cussion*, excepting that the constant applied to ^ is now 3 h 8 m *4, formerly it was 
3 h 6 m *6. They have been calculated from the expressions (See p. 11 7-) 
tan 2 
(A) sin 2 <p 
1 + ( A ) cos 2 <p 
h = D + (E) {{^) cos (2 — 2 q>) + cos 2 
log ( A ) = 9*56284 log ( E ) = 0*63749 D = 16*79 
The columns headed “ Observation” have been deduced from the quantities headed 
“ Mean” in Tables II. and III., by applying to them proper corrections for the devia- 
tions from declination 15°. 
* Philosophical Transactions, 1836. 
