REPORT OX HYDRAULICS. PART II. 505 



AT RICHMOND BRIDGE. 



High Water. 



Above Trin. dat. Below Trin. dat. 

 Years. Tides. ft. in. ft. in. ft. in. 



1832. 88 stood from 1 10 to 3 9 ; mean of all the tides 8'67 



1833. 84 2 2-3 0; 276^ 



1834. 89 1 11-3 7; r- 1 I'TO" 



Low Water. 



1832. 88 stood from 1 4 to 5 6; mean of all the tides 4 4-23 



1833. 84 9-5 2; 3 7-41 = 



1834. 89 4 7-64; 5 5-73<i 



Duration of the Day Flood Tides. 



hrs. min. hrs. min. hrs. min. sec. 



1832. 84 flowed from 1 15 to 2 45; mean of all the tides 1 59 3 



1833. 84 1 15 - 2 30; 1 52 37 = 



1834. 89 1 15-2 20; 1 50 10* 



Conclusions. 



The changes at Richmond Bridge, situate 16 miles fur. 6 pol. 

 ahove London Bridge, have been as follow : 



1. The high-water mark at thetop~l 1 in. higher than in . 1832 



of spring tides stood in 1834J 3 ins. lower than in . 1833 



2. The high- water mark at the ex- 1 „. ,., ,, . ,c,cn 



. = r 4.-J * J 2 ms. higher than in . 1832 



trenie or neap tides stood > ^, • i° ., . toco 



1R34 ' "■'^" ^^^'^'' "^^" ^^ • 1^^^ 



3. The high-water mark upon thel 5*03 ditto ditto . 1832 



average stood in . . . 1834J 10-94 ditto ditto .1833 



4. Thelow- water mark at the top of \ 39 ditto ditto .1832 



spring tides stood in . 1834/46 ditto ditto . 1833 



5. The low-water mark at the ex- 1 ^^ ^.^^^ ^j^^^ _ ^332 



treme of neap tides stood ^^ ^.^^^ ^^^^ ^ ^333 

 m . . . 1834 J 



6. The low-water mark upon the\ 13-50 ditto ditto . 1832 



average stood in . . . 1834/22-32 ditto ditto . 1833 



ft. in. 



* Or 5-91 which the high-water mark had risen, 

 b Or 5-03 which the high-water mark had fallen. 

 <= Or 8-82 which the low-water mark had risen. 

 •1 Or 1 1-50 which the low- water line had fallen. 



* Or 6 min. 26 sec 



* Or 8 min. 53 sec 

 1834. 2 K 



> ccrease in the duration of the flood tide. 



