SEISMOLOG[CAL REPORTS 49 



The tabulated records of the Seismograph are sent to Professor 

 Milne for pubhcation in the Annual Report of the Seismological 

 Committee of the British Association. 



MELBOURNE OBSERVATORY. 



P. BARACCHI, Government Astronomer for Victoria. 



Seismological records have been obtained continuously through- 

 out the period January ist, 1909, to December 3lst, 1910, by means 

 of a Milne Horizontal Pendulum as in previous years. 



SOUTH AUSTRALIA. 

 C jF. DODWELL, Government Astronomer for South Australia,] 



A Milne Horizontal Pendulum Seismograph, recording the 

 E-W component, has been in continuous operation at the Adelaide 

 Observatory since June 22nd, 1909, a few days' registration only 

 having been lost, owing to alterations in the seismograph room, 

 failure of the light, etc. This instrument has been described in 

 a paper on S.A. Earthquakes, read before the Association in 

 January, 1909. Gradual changes of level, of a seasonal nature, 

 have been recognised in the records,, and on one or two occasions 

 the level change has been large and sudden, probably due to the 

 heavy rains of winter affecting the foundations. 



The total number of distant earthquakes, from June 22nd, 

 1909, to December 31st, 1910, whose maxima were of greater 

 amplitude than 2.5 mm., was 28., four of these being in 1909 and' 

 24 in 1910. One large earthquke in 1910 was not recorded, owing 

 to a temporary failure of the light. Many of these earthquakes 

 appear to have originated in the Pacific Islands. 



The tabulated records of the seismograph are sent to Professor 

 Milne for publication in the Annual Report of the Seismological 

 Committee of the British Association. 



