204 
ON THE DIURNAL VARIATION OF TERRESTRIAL MAGNETISM. 
II. Velocity Potential : 3A 2 2 sin 2 0 cos {2 (A+ £)-<*} (continued). 
II 
29 3 , 
25920 ‘ 1 
II 
■X 
1 3 
1] 20 / 
= 
11 , 3 
18900 1 / ‘ 
qr = 
0. 
?3 2 = 
29 ,4 
] 03680 / ' 
9i 2 = 
0. 
2o 2 = 
1 V- 
37800 7 
PRESENTED 
B MAY 1908 
' V*AL '' ' 
