16 



GENERAL RADIO 397 AMPLIFIER AND FILTER 



NPUT 

 11 



OUTPUT 

 I 1 



LEEDS & NORTHRUP 



4754 AC-DC 

 DECADE RESISTOR 



lO^-IO^n 



vyw- 



=Hq 



B D 



si^H 



LEEDS & NORTHRUP 1553 

 CAMPBELL- SHACKELTON A' 

 BOX 



C' 



SV 



INPUT 



{^ 



RCA W0-33A 

 OSCILLOSCOPE 



IT 



VERTICAL 



HORIZONTAL 



FT^^^^v 



t± 



LvyjU I vf ^ 



^ 



GENERAL RADIO 



1203-B 

 POWER SUPPLY 



GENERAL RADIO 



1210-C R-C 



OSCILLATOR 



::cELL 



FIGURE 10 CONDUCTIVITY BRIDGE 



