TIDES OF PORT ADELAIDE. 277 



Earthquake Shocks in Tasmania, April, 1883, to December, 1886— continued. 



Total Intensity 



per Month 



in Millimetres 



per Sec. 



1886. 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



Total for 45 months 



390 

 60 

 170 

 390 

 230 

 620 

 120 

 230 

 960 

 240 

 740 



Average intensity of shock = 73*5 millimetres per sec. 



-o-^J-o- 



-ORIGIN OF EARTHQUAKE OF 27th JANUARY, 1892 

 (AUSTRALIA AND TASMANIA). 



£>/ G. HOGBEN, M.A. 



'©-►Ji- 



7.— THE TIDES OF PORT ADELAIDE. 

 By R. W. CHAPMAN, M.A., and Captain IXGLIS. 



At the last meeting of the Association in Hobart we presented 

 to the section the results of an harmonic analysis of the curves 

 obtained from the tide gauge at Port Adelaide. This analysis 

 only embraced the short period tidal components. We afterwards 

 extended the computations to include the fortnightly, monthly, 



