ON SEISMOLOGICAL INVESTIGATIONS. 41 
4 
Seismological Investigations.—Ninth Report of the Committee, consist- 
ing of Professor J. W. Jupp (Chairman), Mr. J. MILNE (Secretary), 
Lord Krzv1, Professor T. G. Bonney, Mr. C. V. Boys, Professor 
G. H. Darwin, Mr. Horace Darwin, Major L. Darwiy, Professor 
J. A. Ewine, Dr. R. T. Guazesroox, Mr. M. H. Gray, Professor 
C. G. Knort, Professor R. Metpota, Mr. R. D, OLDHAM, Professor 
J. Perry, Mr. W. #. Piummer, Professor J. H. Poyntine, Mr. 
CLement Ret, Mr. Netson Ricnarpson, and Professor H. H. 
Turner. (Drawn up by the Secretary.) 
[Puates I. AnD II.] 
CONTENTS. 
PAGE 
I. General Notes on Stations and Registers _. ; : 4 : : . 41 
Il. Comparison of Records from three Milne Horizontal Pen dulums . - Aa 
Ill. An Improved Record Recewer : : : - : : 0 . 43 
IV. The Origins of Large Earthquakes in 1903. - : é , ; . 43 
V. On International Co-operation for Seismological Work : : : . 45 
VI. Seismological Work now in progress . : : : - : . 46 
VIL. Directions in which Seismological Work may be extended . : : . 48 
. 5 51 
VIII. Experiment at the Ridgenay Fault 
I. General Notes on Stations and Registers. 
Durine the past year the registers issued are Circulars Nos. 8 and 9. 
These refer to Shide, Kew, Bidston, Edinburgh, Paisley, Toronto, Vic- 
toria, B.C. ; Baltimore, San Fernando, Cairo, Ponta Delgada, Cape of Good 
Hope, Alipore, Bombay, Kodaikanal, Batavia, Irkutsk, Perth, Mauritius, 
Trinidad, Tiflis, Christchurch, Wellington, Cordova, and Tokyo. Captain 
H. G. Lyons, R.E., Director-General of the Survey Department at Cairo, 
writes that the Abbassia records terminated on December 23, 1903. On 
the same day they were recommenced at Helwan, long. E. 31° 21’, 
lat. 29° 52’. At Abbassia, in the delta, the foundations were on sand, 
and during wet weather may have been disturbed. At Helwan the 
instrument stands on a limestone pier founded on solid rock. 
It is anticipated that an instrument will shortly be installed at Malta. 
The multiplication in the number of stations, scattered as they are all 
over the globe, has led to a great increase in the work of correspondence 
and reduction which has to be undertaken at Shide. Much of this work 
might well be done by an assistant under the supervision of the Secretary, 
leaving the latter more free to devote himself to scientific problems. The 
Committee consider that the time has arrived when a fund should be 
established to provide a sufficient income for securing the continuity of 
the work in the future. Upon such a fund the salary of an assistant 
would be a principal charge. The Committee are happy to be able to 
report that Mr. M. H. Gray has very generously given the sum of 1,000/. 
to serve as the nucleus of such a fund, while the Committee on Geophysics 
of the Carnegie Institution of Washington have also expressed a desire to 
contribute to the important work which is being carried on at Shide. 
The Committee are in correspondence with the Executive Committee of 
the Carnegie Institution, and they trust that donors will come forward to 
assist in putting the work upon a permanent basis. 
Tt may here be mentioned that Mr. M. H. Gray has already given 
