The testing at Batavia compared with the records of 
ApiE's magnetograph. supplied the following result tor the 
secale-value of the Hor. Int.-instrument: 
Lemm == 0.89 (Jan: 22—23, 1901). 
For influence of temperature, L found: 
Extreme temp. 27.°30 and 31.°62: 4.6 mm. per 1° C. 
March 9—10. 
Extreme temp. 26.85 and 32.56: 6.6 mm. per 1° C. 
March 12—13. 
As to the last determination is to be given a double weight, 
we get: 
5.9 mm.-per 1° C. 
At Karang Sago the scale-value was determined by alter- 
nately placing a deflector-magnet at equal distances from 
the H. and D. magnets perpendieularly on each of the two 
magnets. 
Result: 
bn. == 10 May 6. 
The influence of temperature was determined by heating 
the hut with numerous lamps; the variation of the H. F. 
being determined from the Batavia-magnetogram. 
Result: 
5.0 mm. per 1° C May 19—20. 
The measuring of the distance: Cylinder-mirror gave the 
following value for the declinogram: 
1] mm. == 1. 10. 
The thermometer of the H.-instrument was read at irregular 
hours, the readings, however, gave sufficient information 
about the daily variation of temperature. 
