seismological committee. 65 



Perth Observatory, Western Australia. 

 H. B. Curlewis, Acting Government Astronomer. 



A continuous record of earth tremors was made at the Perth 

 Observatory during 1911 and 1912. The instrument is an improved 

 quick-moving Mihie Seismograph. 



The Survey Department proposes startiiig a magnetic station in 

 the vicinity of Perth. A simplex magnetometer was obtained from 

 England for the purpose. 



Melbourne Observatory. 



P. Baracchi, Director'. 



The registration of seismic disturbaiices by Milne Horizonta 

 Pendulum Seismograph has been continued throughout the vears 1911 

 and 1912. 



TEKRESTRIAL MAGNETISM COMMITTEE. 

 (See Vol. XII., p. 50.) 

 By P. Baracchi, Director, Melbourne Observatory. 



The Melbourne Observatory is still the only Permanent Magnetic 

 Station in Australia where the registration of the magnetic elements 

 has been secured uninterruptedly throughout the years 1911 and 1912. 



The daily traces for magnetic declination horizontal and vertical 

 components extending over a period of some 40 years have been practic- 

 ally measured, and the results tabulated up to date, and the work is 

 now being prepared for the press. 



Assistance was rendered to Dr. Mawson's Antarctic Expedition iji 

 adjusting magnetic instruments and training observers in their use. 



The magnetic work done by Mr. Kidston on behalf of the Carnegie 

 institution, for effecting a preliminary magnetic survey of Australia 

 is dealt with in a separate paper by that gentleman. 



The Committee recommends that the Council be asked to express 

 its appreciation of the magnetic work done under the auspices of that 

 institution, in Australia, and for the assistance rendered by its officers 

 now in Australia to the Mawson Expedition. 



This Committee was re-elected, ^vith the addition of the names of 

 Edward Kidston (Carnegie Institution), G. F. Dodwell (Adelaide 

 Observatory), Professor Kerr Grant (Adelaide University). 



Supplementary Report hy G. F. Dodwell, Government Astronomer for 

 South Australia. 

 In June, 1911, Dr. L. A. Bauer, Director of the Department of 

 Terrestrial Magnetism, Carnegie Institution, U.S.A., visited Adelaide 

 in connexion with this magnetic survev of the world, and selected 

 6117- C 



