3,24 MR. THOMAS CARRICK ON THE 



h. ni. 



Portland Breakwater 711 



Lyme Regis ^ 33 



Torbay 614 



Plymouth 5 54 



Falmouth 517 



Penzance 4 52 



Taking now the south-western end of the same nodal 

 line^ and moving in the same direction as before, the 

 hours are — 



h. m. 



Penzance 4 52 



St. Ives 56 



Lundy Tsle 5 34 



St. Ann Lighthouse, Milford Haven . . 617 



Cardigan 7 '9 



Aberystwith 7 47 



Bardsey Island 7 59 



Caernarvon 9 50 



Holyhead 10 29 



Amlwch (north coast of Anglesey) . . 1047 



Thence high water becomes nearly simultaneous over 

 a large extent of coast, the time averaging n^ 20"^ over 

 all the open coast of Lancashire and Cumberland. 



At both ends, therefore, of the nodal line there is an 

 equal progression of the wave over about 90° of arc in 

 about 6 hours of time, then a nearly simultaneous tide 

 over about 45° of arc (at 1 1^ 20"^ and 1 1^ 25°^ respec- 

 tively) at the opposite ends of the line, and then uncon- 

 formable houi's in the south, where the progression of the 

 nodal line in the north is interrupted by the mainland 

 of England. 



It is not difficult to point to the probable causes of the 

 abnormal progression of the waves of the south coasts of 



