OBSERVATORIES AND THE DATA OBTAINED. 95 
ZI-KA-WEI, CHINA. 
Meteorological, Magnetic, and Seismological Observatory. Rev. Louis Froc, 8. J., 
director. 
Lat. 31° 12’ N.; long. 121° 26’ E.; altitude, 7 meters; distance, 88.49° or 9,838 km.; 
chord, 8,889 km.; direction, N. 50° W. 
Foundation, alluvium. 
Seismograms, sheet No. 15. 
The instrument used was an Omori horizontal pendulum, east component; mechanical 
registration on smoked paper. 7’, 33.2 seconds; V, 15; J, 4,100 meters; ¢, 1.07; 7, 1.5 
mm.; M,15ke.; L, 75.6 cm. 









F b) Ss 
Paatiwivaky eoees (d) RecuLar PeRIoD. 
TREMORS. TREMORS. 
, mM. 8: m 8. m. 8. . sec. 
East component. . . 25 24 35 36 56 00? 29.6 
Tntervalicn y- ose 12 56 23 O8 43 321 
J 


The beginning of the movement is not shown on the seismogram, and the beginning 
of the long waves is not very clear. At 58" the period of the waves is 26.4 seconds and 
the recorded amplitude 20 mm.; the actual magnifying power is 40.5, making the earth- 
amplitude 0.6 mm. At 09" the period is 29.6 seconds, the recorded amplitude 27 mm., 
and the magnifying power 60; and therefore the earth’s amplitude is only 0.45 mm. 
PILAR, ARGENTINA. 
Observatorio Magnetico. W. G. Davis, director. 
Lat. 31° 40’ S.; long. 63° 50.5’ W.; altitude, 340 meters; distance, 88.75° or 9,866 
km.; chord, 8,909 km.; direction, 8. 47° E. 
Foundation, compact alluvium. 
Seismograms, sheet No. 1. 
The instrument used was a Milne horizontal pendulum, east component. T,, 15 
seconds; V, 6.1; J, 340 meters; e, 1.076; M, 255 gm.; L, 15.6 cm. 
First preliminary tremors, 25.6"; interval, 13.1 minutes. Maximum, 36.8"; interval, 
24.3 minutes. Amplitude, 0.2 mm. 
Duration, 1.3 hours. It is impossible to determine the beginning of the motion from 
the reproduction of the seismogram; it is only possible to see a small swelling at the 
time of the maximum, which apparently occurs during the second preliminary tremors. 
It is not clear why the record should have been so small. 
URBINO, ITALY. 
Osservatorio Meteorico-Sismico. Prof. T. Allipi, director. 
Lat. 43° 43’ N.; long. 12° 38’ E.; distance, 88.82° or 9,875 km.; chord, 8,916 km. ; 
direction, N. 30° E. 
The instrument used was an Agamennone vertical pendulum (modified), two horizontal 
components; mechanical registration with ink on white paper. T7,, 5 seconds; V, 24; 
J, 150 meters; M, 112 kg.; ZL, 6.2 meters. 
(1) North component: 13" 54" 50° to 14" 16™ 00°. 
(2) East component: 13" 56™ 40° to 14" 11™ 00°. 
Observations much too late; they probably represent only the principal part. The 
earlier phases were not recorded. 
