92 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
The instruments used were: 
Bosch-Omori horizontal pendulums, two components; mechanical registration on 
smoked paper. 
(1) North component: T,, 23 seconds; V, 10; J, 1,300 meters; ¢, 1.17; M, 11 kg.; 
L, 75 cm. 
(2) Hast component: 7, 21 seconds; V, 10; J, 1,050 meters; ¢, 1.17; M, 11 kg.; 
L, 75 em. 
Vicentini-Konkoly vertical pendulum, two components; mechanical registration on 
smoked paper. 
(3) North component: T,, 2.5 seconds; V, 41; J, 64 meters; e¢, 1.105; M, 105 kg.; 
L, 1.55 meters. 
(4) East component: T,, 2.5 seconds; V, 49; J, 76 meters; «, 1.105; M, 105 kg.; 
L, 1.15 meters. 








F S 
Pavuttie Prsuainaee PRINCIPAL Max. PERIop. 
TREMORS. TREMORS. Any 
™. &. ™ &. m. 8. m,. &. sec. 
(1) North component . 15a 0 35 57 54 18 00 21 20 
(2) East component . 25 28 36 20 52 59 06 32 18 
(3) North component . eee fir ier bases 56 44? | 02 O1 ye 
(4) East component . : Saleiae sub ahe ol 24 00 32 19 
AVerage ne a.) 25 20 36 608 
Interval] =) 12 52 23 40 




Duration, (1) 2 hours; (2) 1.8 hours; (3) 36 minutes; (4) 54 minutes. There is little 
concordance in the times of the principal part, and in the absence of the seismograms 
these values can not be used in the determination of the velocity. 
The times, periods, and amplitudes are taken from the “Bulletin hebdomadaire des 
observatoires sismiques de la Hongrie et de la Croatie”; and the earth-amplitudes are 
calculated. The smaller amplitudes of the Vicentini instrument are probably more 
reliable than those of the Bosch-Omori instrument, for the period of the latter is so nearly 
that of the waves that its magnifying power is very uncertain. On the other hand the 
Vicentini failed to record the first and second preliminary tremors, indicating a lack of 
sensitiveness, possibly due to friction. 
The Vicentini instrument at Zagreb, 30 km. further from the origin than O’Gyalla, 
indicates much larger amplitudes, but they also are very uncertain. 
FIUME, HUNGARY. 
Seismological Observatory. Dr. P. Salcher, director. 
Lat. 45° 20’ N.; long. 14° 26’ E.; altitude, 20 meters; distance, 88.17° or 9,802 km. ; 
chord, 8,863 km.; direction, N. 29° E. 
Foundation, folded Cretaceous limestones. 
The instrument used was a Vicentini-Konkoly pendulum, two components; mechanical 
registration on smoked paper. V,86; M, 100 kg.; Z,1.70 + meters. The movement begins 
on both components (north and east) at 13" 40™ and reaches a maximum, north 54” 18°, 
amplitude 0.8 mm.; east, 55" 18°, amplitude 1.5 mm. The disturbance lasted 27.5 and 
47 minutes, respectively, on the north and east components. It is not clear what phase 
the beginning of the movement refers to. 
