REPORT ON HYDRAULICS. — PART II. 503 



Conclusiotis. 



The changes at Putney Bridge, situated 7 niiles 3 furlongs 

 aJbove London Bridge, have been as follow : 



1. The high-water mark at the topi 3 ins. higher than in 1832. 



of spring tides stood in 1834j 2 ditto . . ditto . . 1833. 



2. The high- water mark atextreme"! 14 do. . . ditto . . 1832. 



of neap tides 1833 J 3 ditto . . ditto . .1833. 



3. The high- water mark on average°1 1-56 higher than in 1832. 



tides 1834 J 3-85 lower than in 1833. 



4. The low-water mark at the topi 21 ins. lower than in 1832. 



of spring tides stood in 1834J 24 ditto . . ditto . 1833. 



5. The low-water mark at the ex-\ 5 ins. lower than in 1832. 



treme of neap tides, in 1834 J 7 ditto . . ditto . . 1833. 



6. The low-water mark upon the\7"56ins.lowerthaninl832. 



average stood in ... . 1834J 11*70 ditto .... 1833. 



7. The range of the flood tide upon't 9*12 greater than in 1832. 



the average was in . . 1834 j 7'85 ditto . ditto . 1833. 



8. The range of the flood tide,how. I ^^ ^^^^ ^ ^ ^.^^^ _ ^^^^ 



ever,atthetopofsprmgtides .^^^ ^ ^ _ jg33_ 



was in 1834 J * 



r21 ditto . . ditto . 1832. 



9. The range of the flood tide at the J 1 ditto less than in 1833. 



extreme of neaps was in 1834 | 6 min. 24 sec. longer 



L than in 1832. 



10. The duration of the flood tidel 16min. 11 sec. longer 



upon the average was in 1834 J than in 1833. 



AT KEW BRIDGE. 



High Water. 



Above T. dat. Below T. dat. 

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



1832. 88 stood from 1 7 to 4 8 ; mean of all the tides 1 3*44 



1833. 82 1 10-3 8; 9-61^ 



1834. 89 2 0-4 3) 1 5-37'' 



Low Water. 



1832. 88 stood from 4 6 to 8 11 ; mean of all the tides 8 0*39 



1833. 82 4 10-8 10; 7 5-59"= 



1834. 89 8 2-911; 9 O-SS*! 



ft. in. 



a Or 5-83 which the high-water mark had risen, 

 b Or 1-93 which the high- water mark had fallen, 

 c Or 6-89 which the low-water mark had risen. 

 ^ Or I 049 which the low-water mark had fallen. 



