WAVE OF HIGH WATER. 321 



In the British Islands the conditions become very com- 

 plex, because the essential requirement of wide uninter- 

 rupted ocean-spaces exists only to a very partial extent. 

 Where narrow seas, like the Irish Sea and English Channel, 

 separate two or more land- areas, the normal direction of 

 the wave of each area is opposite on the adjacent shores, 

 and hence two waves of equal force might neutralize each 

 other and tend to destroy all progressive motion. 



It is impossible to include the whole of England and 

 Scotland in one circle approximating the coast-line; the 

 north of Scotland is therefore severed at tlie Frith of 

 Forth, England being treated as a separate area. 



Taking Scotland first, and passing round in the required 

 direction, the hours are — 



h. m. 



Dancansby Ness lo 26 



Wick ., ... II 34 



Fraserburgh . 12 48 



Aberdeen 18 



Montrose ^35 



Tay River Bar 217 



Leith 2 30 



Crinan (on the west coast) . . . 511 



lona Sound 5 37 ' 



Loch Moidart 6 8 



Loch Torridon 6 43 



Loch Laxford 7 4 



Cape Wrath ........ 7 50 



Loch Eribol 81 



Thurso 8 42 



Swona 9 47 



Duncansby Ness . . . , . . 10 26 



In Ireland, from causes already alluded to, the westerly 

 and northerly coasts alone are conformable to the law. 

 The hours are — 



SEU. III. VOL. II. Y 



