Electric Residue in the Leyden Jar. 317 



the sum F of which may be found, and will differ very little from 



r 



lJ^dt. 



The surfaces f, /", /"..., which are bounded by the cui-ves 

 of the residues, may be regarded as triangles, so that we have 



In this we obtain, instead of 



the equation 



where 



2'o(/), 



' F + 



2'o(/)=/l+/2+/3-.-/l, 



which contains no unknown quantity, when for t is substituted 

 the actual time of observation. 



We can thus calculate for all observed disposable charges L^, 

 the loss v^ incurred up to the time of discharge, and have at the 

 same time, according to the former equations, the corresponding 

 concealed residues r^ and the total quantities Q^, which exist in 

 the jar at the respective times. In the three following tables, 

 a", b" and c", the quantities so calculated are placed side by side 

 with the former ones. 



Table o". 



