4-28 I)K. C. CIIREE; ANALYSIS OF RESULTS FROM THE KEW MAC4NETOGRAPHS 
Diurnal Inequalities Expressed in Fourier Series. 
Group of years. 
Temperature, iu degrees Fahreidieit. 
1892 to 189.J. 
1889, 1890, 1899 . 
-1°'91 sin q + 224°-0) +0^-79 sin (2/+ 43°-7) 
+ 0°-14 sin (3/f 17''-7) + 0’-0G sin (4f+180°-9) 
4°-73 sin (/+ 224°• 8) + 0°-79 sin (2/ + 42°'0) i 
+ 0°-13 sin (3/+lG“-l) + 0°-0.b sin (4/+197°'8) i 
Group of years. 
Barometric pressure (unit = O'OOl inch). 
1892 to 189.5. 
1889, 1890, 1899 . 
.5-11 sin (/ + 27°-l)+10-37 sin (2/+ 1.50°-9) 
+ 0-57 sin (3/ + 3° • .5) + 0 ■ 34 sin (4/ + 270° ■ 0) 
3-99 sin (/ + 2i°-7) + 10-78 sin (2f + 148°-9) 
+ 0-97 sin (3/ + 9°-7) + 0-32 sin (4/+ 201°-4) 
Hero as^ain, what strikes one principally is the closeness of agreement l)etween 
results from periods containing so few yeai'S. 
§ Go. As supplementing the results for harometrlc pressure, attention may be drawn 
to the following important results olkained at the Dutch Colonial Observatory at 
llatavia'* for Fourier series expansions of the diurnal inequality. The unit in all 
cases is 1 mlllim. of mercury. 
Mean 
pressure, 
^ 58 + • 
244iour term. 
124iour term. 
Sdiour term. 
Group of years. 
Amplitude. 
i’liasc 
angle. 
Amplitude. 
Phase 
angle. 
Arriplitude. 
I’hase 
angle. 
18GG-70 . . . 
0-81 
0-Gl 
o 
23-1 
0-94 
o 
158-0 
0-04 
o 
7 - 3 
1871-7.5 . . . 
0 • 43 
0'G3 
25 • 4 
0-9.5 
158-1 
0-04 
lG-6 
187G-80 . . . 
0-81 
0-G2 
2G-4 
1-00 
160-G 
0-04 
13-4 
1881-8.5 . . . 
0-91 
0-GG 
26-1 
1-03 
160-5 
0-04 
20-0 
lS^G-90 . . . 
0-71 
0-G2 
28-0 
1-03 
lGO-1 
0-04 
23-4 
1891-9.5 . . . 
0-70 
0-63 
2.5-7 
1-03 
IGl -0 
0-04 
27-0 
189G-1900. . . 
0-82 
0-G3 
25 • 3 
1-01 
IGO-G 
0-04 
29-6 
I would specially call attention to the extreme smallness of the variation In the 
amplitudes of the several terms, and to the fact that 1891 to 1895 represents, as 
compared to the two adjacent groups of years, large sun-spot frequency. 
We know from the important researches of M. Angot, referred to in the 
“ Preliminary Note,” that the connection between magnetic variations and sun-spot 
frecjuency is unmistakable at Batavia as in Europe. 
* ‘ Observation.s made at the Mag. ami Met. Observatoiy at Batavia,’ vol. 23, 1900, p. 143. 
