WAVE OF HIGH WATER. 323 



north being altogether interrupted. And yet, notwith- 

 standing these adverse influences, marked indications of 

 the law are found to exist. 



But, instead of a single wave progressing round the 

 coast within twelve hours, two simultaneous waves move 

 over nearly equal spaces of opposite sides of the island in 

 nearly the same time, with kindred irregularities where 

 the orderly progression is interrupted. 



If, therefore, instead of a nodal line with high water at 

 one end and low water at the other, such a line be con- 

 ceived with high water at both ends, then drawing this 

 line, in the first instance, between Bridlington Bay and 

 Penzance, the wave at the north-eastern end of this line, 

 moving in conformity with the law, will give the follow- 

 ing hours : — 



h. m. 



Bridlington Bay 4 40 



Spurn Point 5 26 



Cromer . 6 55 



Yarmouth Roads , , 98 



Aldborough . 10 38 



Margate 11 34 



At Margate, the orderly progression ceases ; and thence 

 to Christchurch, near the Bill of Portland, high water 

 is nearly simultaneous, the time averaging about 11^^ 



There is no trace of this wave westward of Christchurch 

 (except at Poole) ; but an unconformable wave from the 

 Land^s End reaches Christchurch at 9^ 7™, giving double 

 tides thence to the head of Southampton Water, West- 

 ward of Christchurch the hours are as under : — 



h. m, 



Christchurch (wave from Margate) . . u 37 



Christchurch (wave from Land's End) . 9 7 



y2 



