| Cat 
        No. | Description | 
      
        | 321 | Dial Pattern Potentiometer, 22 Coils 
        (Sen. Pot) | 
      
        |  | 
      
        | 322 | -do- but with 10 coils (Junior Pot.) | 
      
        |  | 
      
        | 323 | Crompton Potentiometer direct reading 
        0.0005 to 1.75 volts | 
      
        |  | 
      
        | 324 | Slide Wire Precision Potentiometer | 
      
        |  | 
      
        | 325 | Vernier Potentiometer (Range - 0.00002 Volt to 1.9 Volts)
 | 
      
        |  | 
      
        | 326 | Accessories : Spot Reflecting Galvanometer | 
      
        |  | 
      
        | 327 | Volt Ratio Box | 
      
        |  | 
      
        | 328 | Standard Cell 1.018 volts DC, Digital  
        Display | 
      
        |  | 
      
        | 329 | 2 Volts Accumulator (Constant Voltage 
        source). | 
      
        |  | 
      
        | 330 | High Precision 
        Decade Resistance Box having seven decades (0.01 ohm to 100K 
        ohms)                              | 
      
        |  | 
      
        | 331 | Direct Reading Potentiometer | 
      
        |  |