OBSERVATORIES AND THE DATA OBTAINED. 103 
The instruments used were: 
Repsold-Zollner horizontal pendulums, two components; photographic registration. 
Seismograms, sheet no. 2. 
(1) North component: 7,, 9.2 seconds; V, 59; J, 1,240 meters; M, 59.1 gm.; LZ, 13 cm. 
(2) East component: 7), 7.94 seconds; V, 60; J, 940 meters; M, 59.1 gm.; LD, 12.7 cm. 
Bosch-Omori horizontal pendulums, two components; mechanical registration on 
smoked paper. Seismograms, sheet No. 13. 
(3) North and (4) east components: 7’,, 12 seconds; V, 10 (?); J, 360 (?) meters; 
M, 11kg.; L, 75 cm. 
First Pre-| SEconD EarTH’s 
P a 
LIMINARY |PRELIMINARY soe. sae a ; cecal Prriop.| AMPLI- 
Tremors. | TREMORS. : ° ; TUDE. 

min. min. in. : : . . sec. mm. 
(1) North component .| 26.5 (31.0) 
(2) East component .| (30.7) 37.8 
™m, 8. . ° ™m. &. 
36 56 (09 56) 
(3) North component . Arey 
) East component .| (51.26) | (59 06) (14 27) 
Average .°. .-:.| 26.5 37 22 
Diter vee vcadcag est 14.0 24 54 








The times in parentheses are not used, as they are evidently erroneous; the cause is 
unknown; the times of (4), for instance, are all much too late, but I can not discover 
the cause. (4) also indicates an earth-amplitude of 20 mm., which is impossible. 
CHRISTCHURCH, NEW ZEALAND.' 
Magnetic Observatory. Henry F. Skey, B. Sc., director. 
Lat. 43° 32’8.; long. 172° 37’ E.; distance, 100.40° or 11,162 km.; chord, 9,788 km. ; 
direction, S. 42° W. 
The instrument used was a Milne horizontal pendulum, east component; photographic 
registration. V, 6.1; M, 255 gm.; ZL, 15.6 cm. 
East component: Second preliminary tremors, 33.6"; interval, 21.1 minutes. 
Regular waves, 01.0", interval, 48.5 minutes. Maximum, 30.0". Amplitude, 6.8 mm. 
Duration, 3.3 hours. 
MANILA, PHILIPPINE ISLANDS. 
Manila Central Observatory. Rev. José Algué, 8. J., director. 
Lat. 14° 35’ N.; long. 120° 59’ E.; altitude, 10 meters; distance, 100.46° or 11,169 
km.; chord, 9,793 km.; direction, 8. 118° W. 
Foundation, sand 14 meters thick over volcanic tuff. 
Seismograms, sheet No. 4. 
The instrument used was a Vicentini microseismograph, two horizontal and vertical 
components; mechanical registration on smoked paper. East-northeast component: 
T,, 2.4 seconds; V, 100; J, 1,430 meters; M, 100 kg.; L, 1.43 meters. 




First Pre- 











REGULAR AMPLI- 
ees WAVEs. Max. TUDE. PerIop. 
m7. 8 min. min. mm, sec. 
22 44 01.0 08.0 0.9 18 

East-northeast component 
Interval 10 16 48.5 


1 The times are taken from Circular 15, issued by the Seismological Committee of the British Asso- 
ciation for the Advancement of Science. 
