403 Mr. Rennell on the Effect 
It is evident, that the direction of the current under consi- 
deration, will be influenced by the form and position of the 
opposite shores, at the entrance of the Strait ; and as these 
are materially different, so must the direction of the stream, 
be, within the influence of each side, respectively. For in- 
stance, on the English side, the current having taken the di- 
rection of the shore, between Dungeness and the South Fore- 
land, will set generally to the north-east, through that side of 
the Strait. (See No. 1.) But, on the French side, circum- 
stances must be very different: for the shore of Boulogne 
trending almost due north, will give the current a like direc- 
tion, since it cannot turn sharp round the Point of Grisnez, 
to the north-eastward ; but must preserve a great proportion 
of its northerly course, until it mixes with the waters of the 
North Sea. And it may be remarked, that the Britannia, when 
driven to the eastward of the Goodwin, would fall into this 
very line of current. 
There is another circumstance to be taken into the account; 
which is, that the shore of Boulogne presenting a direct obstacle 
to the water impelled by the westerly winds, will occasion a 
higher level of the sea, there, than elsewhere ; and, of course 
a stronger line of current towards the Goodwin. (See again 
No. 2.) 
It must, therefore, be inferred, that a ship, passing the Strait 
of Dover, at the back of the Goodwin Sands, during the pre- 
valence of strong W. or SW. winds, will be carried many 
miles to the northward of her reckoning*; and if compelled 
to depend on it, may be subject to great hazard, from the 
Goodwin. 
Jt will be understood, of course, 
