May ’ĳ” 
13 
14 
15 
16 
17 
Mean 
Loe. time. Reading. 
| 7h 25m 27,°34 
6 25 42 
6 45 07, 
f6 27 40 
\7 40 68 
6 29 24 
im: 10 
6 42 74 
6 38 02 
6 48 27.31 
— 176 — 
Loe. time. Reading. 
Gele T ID 
10 0 
Je 
28. 00 
27 
. 10) 
Loe. time. Reading.| Loc. time. Reading. Loc. time. Reading. 
12% 
11 45 
11 10 
om 27.,°92 
27. 76 
27. 
27. 
27. 
zj 
16 £ 
90, 4 6 
| 41 50m 28,°22 
29. 22 
28. 16 
28. 40 
27. 45 
28. 27 
71570 280924 
14 
50 
28. 
28. 
30 
46 
27. 29. 00 
28. 50 
28. 
28. % 
0 
8 
8 
6 
6 
8 
7 
7 
7 28. 
Acecordingly the increase ot temperature is only about one 
seventh of that of the open air and the maximum. is not 
reached until late in the evening: the efficacy of protec- 
ting the H.-instrument from sudden and large temperature 
changes has thus been proved. 
For establishing the normal daily oscillation of H and D 
at Karang Sago, the records for the period May 9—17 were 
available. 
After elimination of one day with disturbance (May 10) 
and one with failed registration (May 12), the reading of 
the magnetograms gives the following hourly values uncor- 
rected, only the mean values having been corrected. 
