494 Prof. H. F. Weber's Researches on 



and 



The general solution, taking into account all the conditions, 

 is therefore : — 



gss *A + *J, _ 8frr-*) „1 2 sin ^) e0 s(^ ,),-"&-'. (5 ) 



The above-described method of experiment permits only the 

 variable concentrations of the boundary layers (for ^=0 and 

 .r=L) to be observed. The variable concentration of the 

 upper boundary layer may be denoted by z r , that of the lower 

 by z" . From (5) we find 



1 . /Sir/A _*? w I 



nd 



I ""TO* + B 8m ( tt> L 



and 

 therefore 



7T 



and 



4ir2 



L 2*< 



In all the experiments made, L was constantly chosen so 

 small (about 3 centims.) that the values of the terms 



1 . /4tt/A 



r m \nr) 



e l* 



ana 



25rr2 



1 . /Stt/a _»=!« 



