OBSERVATORIES AND THE DATA OBTAINED, 97 
BELGRADE, SERVIA. 
Royal Astronomical and Meteorological Observatory. Prof. Dr. M. Nedelkovitch, 
director. 
Lat. 44° 48’ N.; long. 20° 09’ E.; distance, 90.67° or 10,080 km.; chord, 9,061 km.; 
direction, N. 25° E. 
Foundation, argillaceous alluvium, 130 meters thick, on Cretaceous limestones. 
The instrument used was a Vicentini-Konkoly microseismograph, two components; 
mechanical registration on smoked paper. 
(1) North component: T,, 2.4 seconds; V, 33; J, 47 meters; M, 105 kg.; L, 1.48 
meters. 
(2) Hast component: T,, 2.4 seconds; V, 48; J, 63 meters: M, 105 kg.; L, 1.48 
meters. 
Average: Second preliminary tremors, 36" 54°; interval, 24" 26°. Maximum, 02™ 51°. 
Amplitude, 1.0 mm. 
Duration, 1.9 hours. 
CARLOFORTE, SARDINIA, ITALY. 
Stazione Astronomica Internazionale. Dr. L. Volta, director. 
Lat. 39° 08’ N.; long. 80°19’ E.; altitude, 18 meters; distance, 90.71° or 10,085 km. ; 
chord, 9,067 km.; direction, N. 36° E. 
Foundation, trachitic rock. 
The instrument used was a Vicentini microseismograph, two horizontal components; 
mechanical registration on smoked paper. 
Northwest and northeast components: 7, 2.2 seconds; V, 50; J, 60 meters; e, 1.0. 
r, 0.1 (northwest component), 0.05 (northeast component); M/, 100 kg.; L, 1.20 meters; 
The original seismogram (too faint for reproduction) does not give clearly the times of 
the phases, but it shows, at 14° 07", waves of period 17 seconds and amplitude 0.5 mm.; 
as the magnifying power for these waves is 0.85, the earth’s amplitude at that time was 
0.6 mm., and since this amplitude was common to both components, the total possible 
amplitude of the earth’s movement was 0.85 mm. At 14" 02™ the northeast component 
shows waves of period 20.4 seconds and amplitude 0.2 mm., indicating an amplitude of 
the earth in that direction of 0.34 mm. On the northwest component the amplitude is 
0.2 mm., and period 27 seconds, therefore the earth’s amplitude is 0.6 mm.; the move- 
ment at this time has a stronger component in the northwest direction, that is, in the 
direction of propagation. 
SARAJEVO, BOSNIA. 
Meteorologisches Bureau. Herr Ph. Ballif, director; Herr Passinj, section chief. 
Lat. 48° 52’ N.; long. 18° 26’ E.; altitude, 633 meters; distance, 90.89° or 10,104 
km.; chord, 9,078 km.; direction, N. 27° E. 
Foundation, clay; on northern slope of a hill. 
Seismograms, sheet No. 15. 
The instrument used was a Vicentini microseismograph, two horizontal components ; 
mechanical registration on smoked paper. 
(1) North component: Tj, 2.2 seconds; V, 156; J, 188 meters; M, 100 kg.; L, 1.20 
meters. 
(2) East component: 7), 2.2 seconds; V, 188; J, 166 meters; M, 100 kg.; L, 1.20 
meters. 
H 
