REPORT OX HYDRAULICS, — PART II. 



495 



Gradation of the Ebbing and Flowing of the Tide at London 

 Bridge, taken above and below, on the 29th of July 1821, 

 being the day of the neiv moon ; by Mr. Giles. 



Above Bridge. 



Low water at Pepper Alley 50 min. 

 past 9 o'clock in the morning. 



Flood Tide. 



ft. in. 



Depth of water when flood "» „ „ 



commenced j 



1st hour lise 2 11 



2nd ditto 3 



3rd ditto 2 10 



4th ditto 2 8 



45 minutes 1 



4 hours and 45 minutes .18 5 



High water at Pepper Alley 35 niin. 

 past 2 o'clock in the afternoon. 



Ebb Tide. 



ft. in. 



1st hour, fall 2 1 



2nd ditto 2 7 



3rd ditto 2 



4th ditto I 9 



5th ditto 1 5 



6th ditto 1 2 



7th ditto 1 



55 minutes 11 



Depth at low water 5 6 



7 hours and 55 minutes 18 5 



Low water at Coxa's Quay, 30 min. 

 past 9 o'clock in the morning. 



Flood Tide. 



Depth of water when flood "> 



commenced J 



1st hour, rise 5 



2nd ditto 5 



3rd ditto 2 



4th ditto 2 



48 minutes 1 



Below Bridge. 



1 3 



9 

 4 

 9 

 5 

 4 



4 hours and 48 minutes . 18 10 



High water at Coxe's Quay, 18 min. 

 past 2 o'clock in the afternoon. 



Ebb Tide. 



ft. in. 



lsthour,fall 2 1 



2nd ditto 4 4 



3rd ditto 3 1 



4th ditto 2 7 



5th ditto 2 3 



6th ditto 1 9 



7th ditto 1 6 



59 minutes 11 



Depth left 4 



7 hours and 59 minutes 18 10 



Difference between the Levels of high- and low-water Spritig 

 Tides, bettveen Rotherhithe a7id Battersea, in the year 1820. 



Rotherhithe Old Horse Ferry ... 21 10 



London Old Bridge 18 2 



Blackfriars 14 9 



Westminster 12 6 



Vauxhall 12 2 



Battersea H g 



From Battersea Bridge to London Bridge . . 5 miles. 

 From London Bridge to Old Horse Ferry . . 1^ ditto. 

 From London Bridge to tlie Nore 44 ditto. 



