— 932 — 
Batavia. 
In my first report I accepted the average of the readings 
for the period May 9—17 as a normal, especially to obtain 
corresponding results for Karang-Sago and Batavia; now 
will take the average values of the quiet days in May 1901. 
For the vertical intensity, however, no other curve than 
the one for May 1887 is at my disposal, because the Z-curves 
in 1901 are too much disturbed by the currents of the electric 
cars to take any readings from them. 
The curves in the plate are plotted after the following 
readings. 
Departures from the daily mean. 
D. H. Z. 
Bat.Aime. May 18th. Normal. May 1Sth, Normal. May 18th. Normal. 
, 
l'a —0.'2 0/0 —19» — 7y 3 y 2 y 
2 4), 1 0,0... —10 $ 1 1 
3 0.0 WR ek -— | 1 0 
4 0.0 0 4. 8 — 6 2 0 
5 00.—01 —7 — 4 3 Se) 
6 1.0 Dt. — 1 0 | — 4 
7 1.0 0.7 3 3 — 1 > | 
8 0.1 0.0 9 9 e — 4 
9 —0.7 —0.9 15 18 c $ — 6 
10 -le —1.1 29 26 —11 —10 
11 i4 ge 29 29 —12 mE | 
12 —0.4 —0.6 22 23 10 TEM 
1 0.0 .—0.2 12 15 ene 0 2:10 
9 0.8 0.4 9 6 — 8 = 8 
3 1.0 0.7 4 — 1 e y su» 
4 0.7 1.0 — 6 dq 3 1 
5 0.4 LO. «<= 10 25 8 
6 —0. 1 0.5 | —10 —11 26 12 
7 —0. 2 0.4 —19 —12 5 10 
8 0.0 0.4  —10 —12 1 11 
9 — 04 —01 —9 —11 1 10 
10 —0.3. —0.1 —7 “I 0 8 
11 —0. 2 0.0 ` 13 0 6 
12 00 0.1 —9 —10 — 3 4 
