INDUCTANCE AND CAPACITY 355 



The usual construction of the terminal blocks for putting the 

 sections in parallel is shown in Fig. 210. By the proper insertion 

 of the plugs, the sections may be put in parallel as desired, any 

 section may be discharged, or the whole condenser may be 

 short-circuited. 



For precision standards of small capacity, this scheme of 

 connections is open to the objection that the capacity of the top 

 itself, which depends upon the position of the plugs, is included 

 between the terminals. For precision work, it is better to have 

 each section provided with small and well-insulated terminal 



FIG. 211. Subdivided precision condenser. 



posts, spaced as far apart as practicable. This also allows the 

 sections to be connected in series as well as in parallel. 

 With the series connection the capacity will be 



C = 



2 + C 



The capacity in electrostatic units of a condenser with parallel 

 plates separated by a medium having a dielectric coefficient 

 Kis 



KA 



