FROM ORDINARY DAYS OF THE ELEVEN YEARS 1890 TO 1900. 
*255 
100 b/a, viz., 1‘28, it may be pointed out, is considerably in excess even of that found 
for H, and double that found for V. An analogous result was observed in the case of 
the quiet day ranges. 
The plus and minus signs occur pretty promiscuously in Table XXXIV. Also there 
seems no parallelism between the differences observed in the case of the different 
elements. In short the differences do not suggest anything but accident. Considering 
that the observed H ranges varied from 19'6y to 35'6y, it seems not a little remarkable 
that in seven years out of the eleven, the difference between the observed and 
calculated value did not exceed 0'5y. The mean difference between observed and 
calculated values of I was 0 /- 059, or 6‘7 per cent, of the range in I during the eleven 
years. The agreement is thus closer than in the case of V, though decidedly less good 
than in the case of H. * 
§ 24. Wole’s formula was also applied to the observed amplitudes of the 24-, 12-, 8- 
and 6-hour terms in the mean diurnal inequality for the whole year, in the case of H 
and V. The results appear in Table XXXV. The agreement between the observed 
and calculated values is in general good, especially in the case of the 24- and 12-hour 
Table XXXV.—Constants in Wolf’s Formula It = a + bS. 
Horizontal force. 
Vertical force. 
Mean difference 
Mean difference 
observed~calculated. 
observed-^- calculated. 
a. 
b. 
100 b/a. 
Absolute 
value. 
As 
percentage 
of range. 
a. 
b. 
100 b/a. 
Absolute 
value. 
As 
percentage 
of range. 
Cl 
y 
6-32 
7 
0-0868 
1-37 
7 
0-27 
4-1 
7 
5-62 
7 
0-0317 
0-56 
7 
0-40 
12-1 
C2 
3-49 
0-0440 
1-26 
0-21 
6-0 
3-42 
0-0260 
0-76 
0-15 
7-0 
c 3 
2-04 
0-0103 
0-51 
0-14 
10-5 
1-32 
0-0090 
0-68 
o-io 
10-0 
Ci 
1-05 
0-0028 
0-27 
0-04 
12-1 
0-49 
0-0023 
0-47 
0-05 
22-7 
terms in H and the 12-hour term in V. It is least good in the case of the 6-hour 
terms, whose amplitudes even at their largest are very small. The general tendency 
apparently is for b/a to become smaller, i.e., for the sunspot influence to be less marked, 
as the order of the harmonic increases, but the 24-hour term in V seems exceptional. 
The values obtained for a, b, and b/a for ordinary days in the case of H are very 
similar to those obtained from the quiet day ranges, but are on the whole slightly 
larger. In the case of V the differences between ordinary and quiet day results are 
more marked, and the excess in the b/a from ordinary days over that for quiet days 
is larger. 
