FROM ORDINARY DAYS OF THE ELEVEN YEARS 1890 TO 1900. 
241 
the first three. Thus it sufficed to calculate the a, b coefficients in the usual way for 
D, H and V, and the work so far as D is concerned had been already done. 
The values of a and b for the year, or for any season, are the arithmetic means ot 
the values from the included months. They can thus be deduced at pleasure from the 
values of a and b calculated for the included months, or be specially calculated from 
the inequality for the season. The employment of both methods puts the accuracy of 
the calculations to a very severe test. In fact, to secure agreement to say three 
significant figures it is necessary to carry the calculation at least one place further. 
This test was not in general applied, but all the calculations were carefully checked, 
special attention being given to any apparent irregularities. 
Table XIX. —Horizontal Force (Local Mean Time for Phase Angles). 
Year . 
Ci. 
CCi. 
C>2» 
CC-2. 
C&. 
a 3 - 
Ci- 
a 4 . 
7- 
o 
7 • 
o 
y - 
° 
y - 
o 
1890 
6-81 
119-2 
4-01 
312-4 
2-18 
175 
1-13 
28 
1891 
9-66 
117-1 
5-62 
303-7 
2-37 
166 
1-02 
23 
1892 
13-00 
117-2 
6-52 
301-6 
2-81 
166 
1-32 
22 
1893 
13-35 
114-1 
7-45 
301-7 
3-26 
163 
1-33 
18 
1894 
13-26 
113-9 
7-09 
294-9 
2-60 
167 
1-26 
24 
1895 
11-73 
113-3 
6-15 
298-9 
2-57 
171 
1-20 
22 
1896 
9-81 
114-8 
5-22 
297-2 
2-48 
166 
1-24 
17 
1897 
8-56 
112-3 
4-61 
294-8 
1-99 
173 
1-30 
28 
1898 
8-36 
115-9 
4-14 
302-1 
2-17 
166 
1-04 
25 
1899 
8-10 
115-8 
4-09 
302 • 5 
2 - 36 
174 
1-10 
32 
1900 
6-56 
119-0 
3-85 
306-7 
2-16 
178 
1 12 
20 
Tables XIX. and XX. give the amplitudes and phase angles for the 24-, 12-, 8- and 
6-hour terms in the H and V mean diurnal inequalities for the whole year, each of 
the eleven years being treated separately. 
Table XX. —Vertical Force (Local Mean Time for Phase Angles). 
Year . 
Ci. 
« i - 
A 
Ob-2. 
c s . 
| 
a 3 . 
c 4 . 
a 4 . 
| 
y- 
o 
y- 
o 
y- 
° 
y- 
o 
1890 
5-08 
139-4 
3-39 
273-3 
1-36 
106 
0-47 
282 
1891 
6-84 
145-1 
4-79 
272-1 
1-64 
96 
0 * 60 
295 
1892 
8-10 
148-8 
5-29 
268-5 
1-77 
101 
0-69 
280 
1893 
7-26 
138-8 
5-62 
270-1 
2-26 
97 
0-71 
279 
1894 
8-38 
145-8 
5-32 
269-0 
2-02 
95 
0-60 
292 
1895 
7-70 
148-1 
5-09 
271-6 
1-83 
97 
0-68 
295 
1896 
7-54 
143-5 
4-60 
270-6 
1-78 
105 
0-61 
284 
1897 
7-07 
138-5 
3-95 
268-6 
1-48 
101 
0-52 
286 
1898 
6-95 
142-7 
4-25 
274-2 
1-50 
108 
0-49 
286 
1899 
6-00 
144-0 
3-87 
271-3 
1 - 31 
107 
0-52 
284 
1900 
5-38 
130-0 
3-48 
276-1 
1-60 
103 
0-61 
281 
