DIURNAL VARIATION OF TERRESTRIAL MAGNETISM. 
203 
II. Velocity Potential: 3A 2 2 sin 2 0 cos {2 (\ + £) — a\ 
Pi 
0 _ 
-y 4 . 
105 / 
pp 
= 0 . 
Pi 
Pi 
P- 
Pi 1 
Pi 
o _ 
1 23 . 133 , 
36 T 12960 7 25920 7 7 
.o _ 
1 , , 
80 7 7 " 
1 2 1 .4 
175 7 7 + 1575 7 ’ 
1 
210 
if. 
16 4 5 o 
63 7 567 77 " + 567 7 ' 
Pi 
1 , 41 , 3 191 , 3 
72 77 51840 7 7 + 51840 77 
Pi 1 
Pi 
3 
7 + 
1 
r 
19 
70 ' 5600' 5600 
23 „ 11 
IT 
23625 
'/A 3 . 
25 77 _ 31500 7 7 
Pr = 
8 , 2 , 4 , 3 
63 7 " 567 7 ' 7 + 567 7 • 
Par 
pi 2 
pi 
pi 
2_ _ J_ 
15 270 
270 
1 - 1 , , 
— 7 + -■— 7 7" 
35 ' 5600 ' / 
2100 
53 
38880 7 " 7 " 62208 T 
7' 3 - 
11 
1 
15750 
1 
Ti~ + —-— y 4 
1 ‘ 63000 ‘ 
41 
432 77 311040 
77 a + 
23625 
133 
311040 
~7' 
' ^ 
7 7 • 
9720 
on 7 
Pi = 
1 
7 
140 ' 33600 
1 ,, , 1 . 
77-+ oTnn 7 
8400 
Pi 
pi = 
1 ,, 1 
-77- 
94500 
1 
13440 
42000 
y 3 y'. 
777 
Pi = + 
Pi 
1 
189000 
1 
7'7 ‘ 
1 
283500 
y 4 - 
453600 
7 T- 
<li 
Pi 
1 3 . 
"TO 77 ’ 
-Ly 3 . 
189 r 
2 D 2 
