OBSERVATORIES AND THE DATA OBTAINED. 89 
The period of the regular waves on the northeast component at 13" 56™ is about 
27 seconds; and amplitude 2.8 mm.; indicating an earth-amplitude of 2.7 mm. An 
earth-amplitude of 2.2 mm. is the maximum on the northeast component at 14” 04.4"; 
both of these maxima occur at times of minima on the northwest component. An earth- 
amplitude of 3 mm. is shown on the southeast component at 14" 03"; at this time the 
earth-amplitude on the northeast component is only about 1 mm., so that the total 
amplitude may be 3.3 mm. 
VIENNA, AUSTRIA. 
K. K. Zentralanstalt fiir Meteorologie und Geodynamik. Prof. Dr. J. M. Pernter, 
director. 
Lat. 48° 15’ N.; long. 16° 21.5’ E.; altitude, 200 meters; distance, 86.37° or 9,602 km. ; 
chord, 8,719 km.; direction, N. 26° E. 
Foundation, loam soil. 
Seismograms, sheet No. 9. 
The instrument used was a Wiechert inverted pendulum, two components; mechanical 
registration on smoked paper. 
(1) North and (2) east components: 7, 14 seconds; V, 250; J, 12,500 meters; €, 2.0; 
M, 1,000 kg.; L’, 49 meters. 
(1) North component . 
1 ee Sia ay 
(2) East component 
Average . 
Interval . 
First 
PRELIMI- 
NARY 
TREMORS. 
™m. &. 
25 15 
25 15 
12 47 
SECOND 
PRELIMI- 
NARY 
TREMORS. 
REGULAR 
WAVES. 
PRINCIPAL 
ART. 
EartH’s 
MPLI- 
AMPLI AMPLI- 

™ &. 
36 08 
36 09 
36 «(08 
23 40 
™ 8 
53 58 
5 
min. 
8.0 to 11.5 
ET 5 ale 
57. 
™m. &. 
57 33 
45 05 






Duration, 2.7 hours. The times of arrival of the regular waves is difficult to deter- 
mine; it is possible, but not probable, that they should be taken about 6 minutes later. 
Tho the second group are also slightly questionable, the time given is probably correct. 
The earth-amplitude was slightly larger for the east component; it was 0.21 mm. at 
13" 59.5" against 0.09 mm. for the north component; it was 0.14 mm. at 14” 04.5", 14" 
06.5", and 14" 08"; and for the north component it was 0.19 mm. at 13 58.5™ and 
_ 0.138 mm. at 14" 08”. 
SALO (BRESCIA), ITALY. 
Osservatorio Geodinamico. - Signor P. Bettoni, director. 
Lat. 45° 36’ N.; long. 10° 30’ E.; distance, 86.42° or 9,608 km.; chord, 8,722 km.; 
direction, N. 31° E. 
The instrument used was an Agamennone seismometrograph, northeast and north- 
west components ; mechanical registration with ink on white paper. T,, 7.8 seconds; V, 
10; J, 150 meters; M, 220 kg. 
A very faint movement is discernible at 13" 52", which reaches a maximum of 2 mm. 
amplitude at 14" 05™ on the northeast component. The greatest amplitude on the north- 
west component is only 0.2mm. The transverse waves are therefore much stronger than 
the longitudinal. Earth-amplitudes can not be determined. The seismogram arrived 
too late for insertion in the atlas. 
