o 
38 RESEARCH COMMITTEES. 
diurnal (or semi-diurnal) period, and of a six-monthly 
period; but the records are sufficiently definite to warrant 
very careful observation in the future, with a view to de 
termine the fact or otherwise of such periodic movements. 
On 10th August, 1901, there was shown on the Wellington 
instrument a most remarkable series of records, four or five 
in number (one apparently consisting of two overlapping 
series of vibrations). The first, fourth, and fifth sets of 
vibrations appear to be repetitions of the same earthquake 
movements that have reached the place of observation by 
different paths; the second and third apparently overlap 
and confuse one another. At the time of writing, the 
Strassburg circular for August has not been received, and 
there has, therefore, been no opportunity of comparing the 
Wellington records with those from other parts of the world. 
The amplitude of the second (the largest) set was very large, 
over 40 mm. The amplitude of the first, fourth, and fifth 
sets was, respectively, 6, 5, and 4 mm. 
Messrs. Farr and Hogben have agreed with the observers 
on the Antarctic ship Discovery to keep all three instru- 
ments at a natural period of 15 secs., as nearly as possible, 
and to record all observations in the form annexed (A). 
This is identical with that used by the stations of the 
International Seismological Committee, except that the last 
two columns are added; and it gives all that is asked for 
by the Seismological Committee of the British Association. 
It is recommended that it should be used at all stations in 
Australasia. 
Local earthquakes are also observed by the telegraph 
operators at about 130 selected stations in New Zealand 
(by the courtesy of the Post and Telegraph Department). 
Books of forms B are issued for use to the various stations. 
We propose to continue this system, which has afforded 
results in the past good enough to ensure the determination 
of all the chief earthquake origins in and near New Zealand. 
The records of the Milne Seismographs it is proposed to deal 
with by the issue of a monthly or quarterly circular in the 
form A, which will be published, it is hoped, in a complete 
form once a year in the Transactions of the New Zealand 
Institute. It is suggested that a summary of the most m- 
teresting results should appear in the Proceedings of the 
Australasian Association for the Advancement of Science. 
Further, that photographic copies of important records 
should be exchanged between the various seismological sta- 
tions of the world, and the best of them printed for general 
information. 
