TIDAL OBSERVATIONS. 



393 



Solar Elliptic 



(13) R. 



A = o-o35 cos {2(7 — i'7)<— i2°*o4| 



Lwnisolar Quarter-diurnal (Helmholtz). 



(15) MS. 

 ^=o^oi7C03 {4(7— s<r—i';)'^ — ii 6^79} 



h' 

 ft. 



o^oo 



•00 



•00 

 •01 

 •02 



•03 



■03 



•02 



•01 



o^oo 



2K -0-290 ft.« = 7-i57 ft. io=7i49 ft. Ao-2E-o-29o ft.= -o^oo8 ft.^=^ -o^oi ft. 



The following example will illustrate the manner of computation at pre- 

 sent employed, in which the whole of the CTaluated tide-components are 

 taken into account, excepting those of long period, the values of which, for 

 Kurrachce for successive years, have not agreed well together ; they have, 

 therefore, been omitted in the computation. 



Find the height of the tide at Kurrachee for every hour of the day for 

 1868, November 2, commencing at 0"^ astronomical reckoning. For 1868, 

 November 2, 0" Kurrachce mean time, 



Sidereal time = y=221^86, 



Sim's mean longitude = )j=221^86, 



Moon's mean longitude = (t= 67^42, 

 Moon's mean anomaly = a — ■or =281-00, 



from which the whole of the arguments can be obtained. 



The values of the arguments for the succeeding hours are obtained from 

 the arguments for noon by successive additions of their respective hourly m- 



* In tlic lunisolar declinational diurnal and eemidiurnal tide the sum of E, aud E^ 

 less 0-29 ft., was applied. 



