1890.] Harmonic Analysis of Tidal Observations. .">!."> 



Where an angle falls exactly on a multiple of 5, an arbitrary rule 

 of classification is required, and it is easiest to deem it to belong to 

 the next succeeding 5, rather than to the preceding 5. 



(e.) Sorting according to Values of V m . 



The H. and L.W. are treated in separate tables, similar in form 

 save that the signs of the L.W. heights are omitted. 



The sheets of heights (c) are pinned opposite to the F OT 's on the 

 tables of angles (b), and the heights are then entered successively 

 into the columns corresponding to their F m 's in a table like the 

 following. 



The division into quarter-lunar-anomalistic periods is maintained, 

 but as this sorting is to serve a double purpose, it is necessary to mark 

 the end of the last semi-lunation. In these tables there are two H.W. 

 and two L.W., which fall after the end of 6 semi-lunations, and before 

 the end of xiii quarter-lunar-anomalistic periods. 



Nearly all the entries fall into one quadrant for H.W., and into 

 another for L.W. Thus there are no H.W. entries in the 4 th quad- 

 rant, and no L.W. entries in 2 nd quadrant ; there are altogether only 

 10 H.W. entries in 1 st quadrant, and 3 in 3 rd quadrant ; and there 

 are only 4 L.W. entries in the 1 st quadrant, and 17 in 3 rd quadrant. 

 Something like this would hold true at all ports. 



z 2 



