﻿Determination of the Ratio of the Electrical Units, 



99 



1 Electricity y § 127, and further considered below. There 

 are three outer A, G, D and two inner cylinders B, F, the 

 components of two pairs being of the same length ; and the 

 outer surfaces of the inner cylinders and the inner surfaces 

 of the outer cylinders being accurately worked to the same 

 diameters. One pair A and B are mounted coaxially upon 

 an insulating base and remain undisturbed. The other parts 

 are movable and allow of the formation of two condenser.-. 

 In the first of these the third outer cylinder D is mounted 

 upon A so that the inner surfaces correspond. Upon the 

 accurately worked top of B is placed a disk of the same 

 din meter, and D is also closed above by a plate E. The leads 

 make contact with the cylinders A, B at their bases. Of this 

 condenser and its leads the capacity is unknown. 



Fie. 1. 









E 







L 



D 



C 















£ 



F 

 B 







l i r. 





D 



C 





» 

 A 















A 



B 





» 



1 



In the second arrangement the long pair of cylinders F, G 

 are interpolated, G resting directly upon A and F upon B, 

 while C is removed so as to close F in place of B. The third 

 outer cylinder D with its cover E now rests upon G instead 

 of A. In this way we obtain a second condenser. Although 

 its capacity is unknown, the increase of capacity is accurately 

 that of the intermediate cvlindersF, G considered as forming 



H2 



