106 



KENNELLY AND VELANDER— POTENTIOMETER 



sion from Fig. 5, and shows the vector loci of impedance in the 

 circuit,, the full lines being computed. The small circles indicate 

 the experimentally deduced results. 



Fig. 6. Graphs of vector impedance for a 7?LC circuit, in which either i? or C 



is varied alone. 



Divided Circuit with Inductance and Capacitance in 



Parallel. 



If we take a simple RLC circuit, such as that shown in Figs. 2, 

 4 and 5, and shunt some part of the fixed inductance with an adjust- 

 able condenser, we obtain the connection diagram of Fig. ya, where 

 the inductance coil /, separate from the oscillator secondary, is 

 shunted by the variable condenser c. Commencing with c = o, or 

 the condenser removed, the vector current in the circuit, as deduced 

 from the p.d. across the 10 ohm taps-/'/'', was the vector 01 = 3-6 



