106 



MR. Amy ON THE LAWS OF THE TIDES 



Table ; and then treating these in the same manner as in the latter part of the table 

 on page 35. 



For the age of tide as inferred from range, the times have been ascertained (by 

 interpolating between the times in the Tables of formulee in Section X.) at which the 

 actual value of C^ may be supposed to coincide with the mean value of C^ ; and the. 

 times thus found have been compared with the times at which the moon's hour-angle 

 from the- sun was 3^ 9^ 15^ 21^ namely, June 26, 6^ July 4, 16^ July 1 1, 3^ July 

 18, 9^ July 26, 9^ August 3, 0\ August 9, 16^ and August 16, 15^. An error is 

 here committed alternately -f- and — , and therefore it is proper to use an even number 

 of comparisons. Eight are used at every place except Ballycastle and Glenarm, where 

 only six are used. [It is to be remarked that in the use of the formulae in Section X., 

 a number opposite to a bracket is always held to correspond to the mean of the two 

 times embraced by that bracket.] Xhe means of all the differences at each station 

 between the times thus found from Section X. and the times corresponding to the 

 hour-angles 3'', 9^ &c., are adopted in the following Table as the age of the tide. 

 These* are the true ages of the tide. 



* Tides and Waves, Art. 545. 



