University of Virginia Library

Search this document 
The Jeffersonian cyclopedia;

a comprehensive collection of the views of Thomas Jefferson classified and arranged in alphabetical order under nine thousand titles relating to government, politics, law, education, political economy, finance, science, art, literature, religious freedom, morals, etc.;

expand sectionA. 
expand sectionB. 
expand sectionC. 
expand sectionD. 
expand sectionE. 
expand sectionF. 
expand sectionG. 
expand sectionH. 
expand sectionI. 
expand sectionJ. 
expand sectionK. 
expand sectionL. 
expand sectionM. 
expand sectionN. 
expand sectionO. 
expand sectionP. 
expand sectionQ. 
collapse sectionR. 
7657. RIVERS, Velocity of.—
expand sectionS. 
expand sectionT. 
expand sectionU. 
expand sectionV. 
expand sectionW. 
expand sectionX. 
expand sectionY. 
expand sectionZ. 

expand section 
expand section 

7657. RIVERS, Velocity of.—

I shall
forward your ingenious paper on the subject of
the Mississippi to the Philosophical Society.
To prove the value I set on it, and my wish
that it may go to the public without any imperfection
about it, I will take the liberty of
submitting to your consideration the only passage
which I think may require it. You say,
“the velocity of rivers is greatest at the surface,
and generally diminishes downwards”.
And this principle enters into some subsequent
parts of the paper, and has too much effect
on the phenomena of that river not to merit
mature consideration. I can but suppose it at
variance with the law of motion in rivers. In
strict theory, the velocity of water at any given
depth in a river is (in addition to its velocity at
its surface) whatever a body would have acquired
by falling through a space equal to that
To William Dunbar. Washington ed. iv, 537.
(W. 1804)