446 Mr Whiddington, Specific Inductive Capacities of Liquids 



This galvanometer indicates in a very convenient manner the slow 

 beats set up when A and B are suitably adjusted. 



To determine the capacity of 2) it is merely necessary to adjust C 

 until a definite beat rate between A and B is established and then 

 switch in D. A new beat rate will be set up which can be restored 

 to the original rate by decreasing C, until the decrease in C is equal 

 to the additional capacity of D. The experiment is then repeated 

 with a liquid dielectric in D, the ratio of the two capacities being 

 the Specific Inductive Capacity required. 



It is to be noticed that the actual capacity change indicated 

 by C is not required so long as the scale is known to be uniform 

 by previous calibration. 



It was found in the case of the particular condenser used in the 

 position C that the scale was for all practical purposes uniform 

 over the central portion of its scale, each division representing 

 •0000065 m.f .d. 



In an experiment carried out by Mr L. G. Stanton the following 

 results were obtained using olive oil as the dielectric. 



Dielectric Air. 



The Specific Inductive Capacity of the oil is therefore 2-98 which 

 is very close to that usually given in Physical Tables. 



