Report of Messrs. Humphreys and Abbot. 
Tesis of the formule for slope. 
FFSREGaTATPRSEO 
geen nSeEeSons 
+tter rs Frets 
~~ | Srror. 
New formula, 
wv 
s 
aé =} 
i-} 
2 
— a) C 
WO HOM IO MAORVUNUNSS 
ee oo 
“011g 
Ellet’s 
formula. 
"e1 
peindwoy 
Wa 
*eouRisi(y 
———. 
Measured’ between 
level-stations 
"peulg 
eee ee ee 
*esByosiT 
“9jaUILIEg 
“‘undep ainuixepy 
ee wee ne tee eae 
“TIP 
ee 
d 
2 
700} 300} 320) 32 
280 
567) 221) 237) 26 
’ 
’ 
’ 
b 
’ 
’ 
’ 
r 
t 
7 
’ 
5 
3 
3, 
Date. 
4 W. 
1. w. 1850 
2 
= 
8 
Level-stations, 
e. 
“ 
« 
d Ohio river, 
“ 
dian V) 
“ 
“ “a 
Red river, 
a“ “a 
and Arkansas river, 
“ “ “ 
emine and In 
a“ aL “ 
a“ “ “ 
Mn Lockport. 
“ 
“ 
“ 
“ 
u 
‘ 
“ 
“ 
“ 
B. La Fourche and 
|Donaldsonville and 
a 
Red river 
Arkansas river an 
|Plaq: 
Stream. 
R. Ft. St. Philip and B La Fourche, 
4 
“ 
ppi R 
“ 
“ 
ca 
«“ 
ue 
“ 
uemine. 
a 
‘ 
“ 
«“ 
“ 
“ 
“ 
tt 
“a 
B. La Fourche, 
Mississi 
“ 
B. 
aa 
“a 
Sum, 
