Adams. — Harmonic Tidal Constants of New Zealand Ports. 317 



where necessary. The constants resulting from this analysis are given in 

 column (1), while those for Port Chalmers, which is eight miles lower 

 down the harbour, are given in column (2). 



The constants for Dunedin have been checked by computing from them 

 the heights of the tide on different days, and comparing the values with 

 the gauge-records. The results have shown that the constants have been 

 determined correctly. 



And in order to show the characteristic features of the New Zealand 

 tides a comparative schedule is given — ■ (I) comparing the Various com- 

 ponent tides with the chief lunar tide M 2 = 1, and (II) comparing the diurnal 

 tides with the K x tide = 1 ; and for comparison with Australia the com- 

 ponent tides for Adelaide, Melbourne, and Sydney are also shown. 



In New Zealand the N 2 tide ranks next the M 2 in amplitude, with the 

 S 2 tide third both at Dunedin and Auckland ; while at Wellington the 

 S 2 tide is sixth, being smaller than the long-period tides MSf and Mm, and 

 the short-period tides M 2 , N 2 , and r 2 . 



(1.) New Zealand Tidal Survey : Report of Department of Lands and Survey, 

 Wellington, for 1913-14. — Hourly ordinates for one year beginning 1911, 

 July 1. 



(2.) Thomas Wright, Proc. Roy. Soc, London, A. Vol. 83, p. 127 : Harmonic 

 Tidal Constants for certain Chinese and New Zealand Ports. — Hourly 

 ordinates for the year 1901. 



