ON SEISMOLOGICAL INVESTIGATIONS. 55 
: TABLE V. 
Comparison of Original and Revised Readings of Various Films for the 
Phase P. 
Ascension. Seychelles. 
Quake. Orig. Rev. _ Quake. Orig. Rev. 
Il. .- . .  . —5:5 Not read . Menges ea ee ies peor 
III. es she Ok 5-1 I. OT CRON EERY 3 0 —1: 
Ss Pa [a ee: Bea Rae ieee ae 
Cape T V. . - (37:0) (34-0) 
ey erie For V. epicentre is so distant that tables 
T . —09 +0-2 fail. 
II - 42:3 +429 
It . +63 +58 Sydney. 
‘a ce ae le Ecce) mele ter P96 Ta 
a ee ee ae beer emer We 
Helwan. IT. R j , . +1-7 —13-2 
Readings for Jan. and Feb. confirmed IV. Se A Se a 
former results so consistently that the | For II. an earlier quake is confirmed by 
scrutiny was discontinued as super- Alipore. For III. see Toronto. 
fluous. 
Toronto. 
Perth. Bi A Sar og NOL) be 
eee. 8. +86 13-5 Le eee eG Dee ME es 
iV. ee eed EDD Ii. © ea Oe aes 
V. oe ee te —10-se—o 
San Fernando. For IIT. see Sydney. 
I. Se ow) 0:2 —3:0 eer 
ITl. en eee ete '27-0) ©--6-6 Victoria. 
IV. . : +65 +21-7 V. 5 é é -— 01 — 0-1 
V —0:3 —0:7 Films not sent for other earthquakes, 
After consideration of the above figures, it was decided to apply 
no corrections at all, but to accept the original readings as they stand, 
and in Table VI. these are compared with calculated values. The table 
corresponds to Table III. except that A was now used in km., and 
the grouping is therefore a little different. 
There is room for some difference of opinion as to the 17 records 
marked doubtful; but the 12+13+15+3+4=47 readings in the body 
of the table are probably normal. We thus get at least 47 but not 
more than 64 normal readings out of 108. These figures are better than 
the 1913 figures and encourage the hope that on the whole 50 per cent. 
of the recorded readings for P may be normal; but the percentage 
cannot be higher than this. 
One feature of the records seems to demand further investigation. 
There is a suggestion that the readings are divisible into two groups 
separated by about a whole minute; and this applies also to the 
results for 1913, though they are scarcely numerous enough to declare 
it independently. It will be seen that the records —0°4 m. and —0°5 m. 
are not represented in either table, thus creating an appearance of 
Separation. But this may be purely accidental. 
Coming now to §, Table VII. has been formed in the 
bame manner as before, adopting the same corrections to the tables 
for time of S. There are three consistent observations of S at A 
=15,000 kms. for which the tables are scarcely available but were 
