ne 
mr ARB 
and balance were recently supplied, give full information about 
the variation of the temperature. for which reason the eve- 
readings of WiLp's instruments have been reduced to the 
readings of the magnetograms. The registration of the magn- 
etograph before and after eeclipse-time, although more or less 
disturbed by the Electric Car, admit ot a rough reading. 
The normal variation tor the Hor.-Int. and Deel. has been 
made up from the readings of the magnetograms in the same 
manner as at Karang Sago. 
From the readings of the Wirp’s instruments the values ot 
H. and D. on the full minutes Greenwich time have been gra- 
phically interpolated from the readings of WirLp's instruments. 
WiLp's balance having no sufficient sensitiveness, only 
the registration ot the magnetograph-balance has been made 
avaible. 
The scale-values were: 
Wirp’s Variation-apparatus. Apie’'s Magnetograph. 
EN Ci hd H. 1 mm.=b3 
D. A0 D. MEN 
V. Od 
In the tables following H. has been taken to be 0.367. 
The magnetograms of May 1901 cannot be used for the 
normal movement of the vertical intensity, owing to the 
great disturbances produced by the Electric Car; in stead 
ot May of this sun-spot minimum 1900—1901, May of the 
preceding minimum viz. May 1887 was chosen. 
Mean (relative) hourly values of the magnetie components 
at Batavia: 
Unity 9 =—0.00001 C. G. S. 
Batavia time. | 8h | 9h | 10%/ ILF|Noon| Ik | 2b | ZA 
Bk REN Oe Bs | 
May 9—17, 1901 _dH [28.6 31.8| 39.8 43.5 38.2 20.2 21.7 12.7/ 4.3 0.5) 00 
2 
3 
Ee HdD [13.5 23.1) 27.7 27.6 22.1 15.8 8.9) 44 0.0| 3.2| 19 
us ee { 
May 1887 dv| 7.3 48) 1.5! 00 15 15 3.6 6.71 12.5! 19.5/ 22.8 
