sia 
12 
13 
14 
15 
“16 
17 
18 
19 
26 
27 
28 
” 
” 
” 
” 
31. 
ay 
” 
M.M.A.T. 
H. M. 
1a) 2 
9 10 
3 23 
pa | 
15 4 
15 37 
22 59 
22 14 
21 26 
1 59 
22 19 
14 47 
16 44 
15 53 
19 20 
20 40 
14 40 
2 57 
9 44 
4 53 
ll 58 
ON SEISMOLOGICAL INVESTIGATION. 235 
Curve very slightly disturbed, from 12h. 50m., showing 
minute waves of irregular period and amp., but less than 
2’. Almost normal after 15th. 
No disturbance. 
Minute, sudden, and very short disturbance commencing 
23h. 45m., May 11, duration 6m., consisting of two 
minute waves, amp. 1’. 
Sudden decrease of E. declination indicative of sudden dis- 
turbance, commencing lh. 10m., max. amp. of disturb- 
ance 6’, followed by minute waves of two hours, amp. 
only a few seconds of arc. Very considerable disturbances 
from 6h. 10m. continued for many hours after. 
Disturbance, commenced 11h., with a large wave, amp. 11’, 
period lh., followed by another large wave, amp. 6’, 
period 25m., minute and irregular waves between. 
No disturbance preceding, but minute oscillations shown 
after 17h. 30m., amp. about 1’. 
Slight disturbance at 19h., Dec. 7, consisting of a wave, 
amp. 33’, period 1h. 20m., commencing 18h. 20m., 
followed by very minute oscillation of amp. under 1’. 
Very minute disturbance at 19h. 37m., consisting of asmall 
wave, amp. under 2’, 
1893. 
Minute and irregular oscillations commencing at 17h. 10m., 
amp. generally under 1’, but in one wave at 19h. 10m., 
and in another at 19h. 34m., the amp. is 3’. 
No disturbance. 
Very slight disturbance shown, consisting of minute oscilla- 
tions, commencing at 19h.27m., max. amp. 2}' at 
20h, 15m. 
Curve considerably disturbed from about 11h. 30m. Sudden 
and more marked disturbance at 12h. 0m., amp. of oscil- 
lation being 9’, another marked oscillation at 14h. 47m., 
amp. 73’ in opposite phase from the former. Followed 
by a large wave, period lh., amp. 6’ in opposite phase to 
the preceding. This wave is superimposed by minute 
oscillations. 
Minute waves of very short period following after from 
16h. 30m. for several hours afterwards, amp. from under 
1’ to 24". 
Very minute oscillations from 17h. 50m. continued for 
more than 4h., max. amp. about 13’. Only one of these is 
somewhat more conspicuous than the others, this occurring 
at 18h. 55m. and perhaps another at 20h. Om. 
No disturbance. 
Curve disturbed considerably from 22h., Feb. 15, but shows 
no special characteristic to indicate the commencement of 
a sudden disturbance. The curve shows a series of waves 
of irregular period and slightly varying amp. not exceed- 
ing 3’ generally; but one wave is quite conspicuous. 
This occurs at 8h. 40m. max. phase, period 1h. 20m., 
amp. about 10’ (ten minutes of arc). 
No disturbance preceding a wave, amp. 3’, commences 
6h. 25m., ends 6h. 57m., followed by two minor very 
minute waves ending 7h. 45m. 
Curve almost normal, a few very minute oscillations, amp. 
under 1’ occur from 11h. 10m. and continue for nearly 
12 hours after; of these only one is somewhat more 
conspicuous than the other. This occurs at 13h. 25m., 
amp. about 2’, 
