172 



BELL SYSTEM TECHNICAL JOURNAL 



30x10 



20- 



Q. 



a: 



R2= 2. 1 OHMS 

 Rg= 1.25 MEGOHMS 



R2= 2.1 OHMS 

 Rg=.22 MEGOHM 



R2 = '2 OHMS 



Rg = 1.25 MEGOHMS 



C2 



Fig. 12.7 — Calculated increase in mean plate resistance against capacitance of the 



oscillatory circuit 



Fig. 12.8 — Experimental curves, showing the influence of interelectrode capacitances on 



the frequency 



shown in Fig. 12.6. It is pointed out that the effect of the crystal resistance 

 Ri is to decrease the frequency for the G-C connection and increase the 

 frequency for the G-P connection. The discrepancy between the measured 



