PHILOSOPHICAL 
TRANSACTION S. 
I. The Bakerian Lecture. Experiments upon the Resistance of 
Bodies moving in Fluids. By the Rev. Samuel Vince, A. M. 
F. R. S. Plumian Professor of Astronomy and Experimental 
Philosophy in the University of Cambridge. 
Read November 9, 1797. 
In a former Paper upon the Motion of Fluids, I stated the 
difficulties to which the theory is subject, and showed its in- 
sufficiency to determine the time of emptying vessels, even in 
the most simple cases ; I also proved, by actual experiments, 
that, in many instances, there was no agreement between their 
results and those deduced from theory. The great difference 
between the experimental and theoretical conclusions, in most 
of the cases which respect the times in which vessels empty 
themselves through pipes, necessarily leads us to suspect the 
truth of the theory of the action of fluids under all other cir- 
cumstances. In the doctrine of the resistances of fluids, we 
see strong reasons to induce us to believe, that the theory can- 
not generally lead us to any true conclusions. When a body 
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