ON SEISMOLOGICAL INVESTIGATION. 199 
Notes on Special Earthquakes.' 
October 19, 21h. 30m. G.M.T., 1895 (Strassburg).—The following 
note is derived from a sketch of the photographic trace sent to me by 
Dr. Gerland, of Strassburg. This sketch shows the movements which 
took place in a von Rebeur-Paschwitz pendulum on the morning of 
October 20. 
About 10 a.m. (S.M.T.) there were preliminary tremors, lasting about 
five minutes. These were followed by strong movements, reaching thirty 
or more millimetres, which continued until about 11.30, during which 
time the pendulum was displaced by four steps towards the south. From 
this time the movement died out, but slight movements are observable 
until after 1.30 p.m. The duration of the disturbance was therefore at 
least 34 hours. 
Padua.— Observations made with the pendulum apparatus and multi- 
plying indices of Professor G. Vicentini :— 
} y Heh Me © 
Commencement . ‘ 3 5 ' 3 : . - 10 29 44 
End . 5 ah ae - - 3 : 5 F 2) un bbr” 45 
Duration . ‘ 5 , z ; 3 5 : hee s265 =O 
These times are probably mean European time. 
Nicolaiew (Professor Kortazzi). — Observation with a Hherizisntal pen- 
dulum :— 
H. M. s. 
Commencement N.M.T. . 5 5 ‘ ‘ . 21 30 O 
Shide, Isle of Wight (Milne’s Pendulum).—Unfortunately this dis- 
turbance iGcuuened in the midst of a tremor storm. Its commencement 
and end are therefore lost. 
Strong movements occurred at 22h. 24m., 22h. 27m, and 22h, 32m. 
G.M.T. 
Reducing the observations to Greenwich mean time we obtain :— 
Commencement Maximum 
H. M. 38. H OM & 
Strassburg , ‘ . ° - 21 28 55 22 28 655 about 
Padua . ; ‘ p ‘ . 21 29 44 21h 43 44°, 
Nicolaiew . é : 2 . 21 29 51 
Shide . P ‘ ‘ . unknown 22 300810" 3 
These records show that three types of instrument have each been 
sufficiently sensitive to record the same disturbance. 
September 4, 5, 7 and 8.—It will be observed that on these days, from 
which it must be noted September 6 is omitted, when there was practically 
no movements, that shocks were very frequent. Dr. Gerland of Strass- 
burg writes me that on these days there were many small shocks, and a - 
tendency for the pendulum to move towards the south. 
June 15, 1895.—On the above date Professor Vicentini, at Padua, 
recorded disturbances, commencing at 10.45 a.m. G.M.T., which reached a - 
maximum at about 11h. 14m. p.m., ending about one hour later. 
At Shide a disturbance commenced at 10.30 a.m. G.M.T., but as the 
instrument was dismantled at 11.30 the record is incomplete. 
If we allow forty-five minutes for a disturbance to travel from Japan 
to Europe, and nine hours as the difference in time between Greenwich 
and Tokio, then in Japan mean time the earthquakes and sea-waves, which 
' See Appendix. 
