4.30 DR. C. CHREE: ANALYSIS OF RESULTS FROM TLIE KEW MAGNETOGRAPHS 
winter minimum for temperature occurs unmistakably in January, and so is later 
than the magnetic minimum. 
§ 66. The points of agreement and ditierence between temperature and magmetic 
phenomena are brought out more fully by a consideration of the Fourier series lor 
the diurnal ineciualities of temperature. Such series have been given by General 
St RACK for first order stations of the Meteorological Office employing an 11-year 
period, and for Greenwich employing a 20-year period. Taking General StbacheMs 
figures, I have calculated the annual variation of the “c” coefficients—?.(?., 
the amplitudes of the periodic terms—expressing the value for each month as a 
percentage of the mean of the 12 monthly values. The results are given m 
Table XLVIII., along with corresponding magnetic data representing the mean 
results for 13, I, H, and V, as given in Tallies XXIY. and XX\. In the case of 
and C. 1 . I give a mean result for "V alencia, Falmouth, and Stonyhurst, in addiiion to 
values for Greenwich and Kew. General Strachey’s notation is P for my c. 
Table XLVIII.—Variation of Fourier Coefficients in the Diurnal Inequality, 
throughout the Year. 
cS 
r-* 
3 
0 
d 
a: 
bJj 
d 
0 
"s 
0 
0 
"0 
0 
0 
s 
0 
0 
c 5 
Ph 
< 
1^ 
0 
CO 
0 
0 
0 
Pi 
Temperature (Valencia, Fal- 
135 
115 
81 
52 
40 
mouth, Stonyhurst). . . 
40 
57 
97 
130 
161 
149 
144 
Temperature, Greenwich . . 
37 
62 
92 
127 
145 
151 
152 
141 
127 
82 
00 
32 
,, Kew. 
39 
52 
102 
126 
147 
144 
146 
139 
123 
91 
54 
37 
hlagnetics, Kew .... 
42 
58 
91 
126 
150 
147 
148 
138 
122 
94 
57 
27 
Co. 
Temperature (Valencia, Fal- 
99 
113 
94 
mouth, Stonyhurst) . . 
91 
109 
126 
114 
70 
48 
58 
io / 
13v 
Temperature, Greenwich . 
; ,, Kew.... 
87 
117 
125 
112 
66 
52 
61 
103 
158 
154 
143 
108 
70 
lOO 
113 
157 
111 
40 
33 
23 
87 
167 
124 
90 
i Magnetics, Kew. 
56 
57 
102 
134 
134 
127 
130 
126 
113 
94 
78 
49 
'■3. 
Temperatiue, Greenwich . . 
.. Kew.... 
85 
7l 
43 
114 
149 
144 
153 
130 
69 
69 
95 
78 
68 
73 
50 
37 
120 
178 
134 
157 
149 
102 
45 
87 
i Maenetics, Kew. 
j to 
54 
79 
133 
140 
110 
91 
94 
133 
145 
119 
68 
35 
§ 67. Before discussing Table XLVIII. I wish to explain my position. 
General StracheyI has pointed out that the fact that a diurnal inequality can be 
* ‘ Phil. Ti'aiis.’ fui' 1S93, p. G17. 
t Li>i‘. cti; p. G.'iG. 
