REPORT ON HYDRAULICS. — PART II. 507 



Co7icliisi(ms. 



The changes at Teddington Lock, situated 18f miles above 

 London Bridge, have been as follow : 



1. The high-water mark at the top\6 ins. lower than in 1832 



of spring tide stood in 1834J 12 ditto ditto . 1833 



2. The high-water mark at extreme 116 ditto ditto .1832 



of neap tide stood in . 1834J16 ditto ditto .1833 



3. The high-water mark upon thel 9-01 ditto ditto . 1832 



average stood in ... 1834J 13*39 ditto ditto . 1833 



4. The low- water mark at the top"\ 16 ditto ditto .1832 



of spring tide stood in 1834 J 28 ditto ditto . 1833 



5. The low-watermark at extreme"! 16 ditto ditto .1832 



of neap tide stood in . 1834J 13 ditto ditto . 1833 



6. The low-water mark upon the \ 13-64 ditto ditto . 1832 



average stood in . . . . 1834 J 21*51 ditto ditto . 1833 



7. The range of the tide upon the"! 4 '63 in. greater than in 183 2 



average was in ... . 1834J8-12 ditto ditto . 1833 



8. The range of the tide at the topi 8 ditto ditto .1832 



of spring tide was in . 1834J15 ditto ditto .1833 



9. The range of the flood tide at the\ 2 ins. less than in 1832 



extreme ofneaps was in 1834 J 2 ditto ditto . 1832 



10. The duration of the flood tidel 19min.5sec. ditto . 1832 



upon the average was in 1834j 22 min. 57 sec. ditto . 1833 



11. The average high- water mark'^ 



stood at Teddington Lock ! 3*98 ins. less than in 1832 

 above that at Richmond f 2-48 ditto ditto . 1832 

 in I834J 



12. The average declivity of low-") 



water line between Tedding- I '0512 ins, less than in 1832 

 ton Lock and Richmond p5529 ditto ditto . 1833 

 Bridge, per mile, was in 1 834 J 



