Electric Residue in the Leyden Jar. 483 



In order to show how far this formula agrees with the obser- 

 vations, we will calculate from it the Table a of § 1 , whereby, of 

 course, /i' = /i and Qq' = Qq:— 7 



Table a}\ 



The deviation is here so small, that this approximate formula 

 may be regarded as a very suitable substitute for the true equa- 

 tion of the disposable charge which has not yet been discovered. 



If in any practical application a few minutes only are con- 

 cerned, and if on the whole the jar suffers little loss, the equation 





followed by a few reductions, will be sufficiently correct. 



The curve for the reappearing residue remains yet to be deter- 

 mined by calculation. Attempts have been made to this effect, 

 and the formuliB deduced from the same principles completely 

 fulfill the conditions." As it is not probable, however, that an 

 application of these calculations will be made in practice, we 

 withhold them, more especially as the subject has already occu- 

 pied too much space. 



Appendix I. 



A battery of five jars (Plate VI. fig. 1), each containing a 

 square foot of coating, stood in its box. At sonic distance was 

 the single jar, F, which was to be examined ; the outer coatings 

 of these six jars were carefully connected with each other, and a 

 wire led from them to the moist earth in the garden. In order 

 to charge the single jar l)y means of the batteiy, a thick wire b, 

 to which two thin sjiring-wircs c and d were soldered, was 

 fastened with shell-lac to a lever a ; when this lever fell, the two 

 spring-wires connected, for a very short time, the inner coating 

 of the battery and the knob of the single jar. The conducting 

 2K2 



