Westinghouse Electric (& Mfg.) Co. (1886-1990)

DC Singlephase Polyphase Switchboard Prepayment Standards
  Shallenberger ampere-hour        
  Shallenberger watthour Shallenberger watthour      
  Round Type Round Type     Round Type
  Type A Type A Type A    
  Type B     Type B (early) Type B
Type DC Type C Type C Type C Type B (late) Type C
CW-6 OA, RO OA, RO OA OA OA
  OB OB OB   OB
  OC C series      
  CS, CA CS, CA series CB series   CP
  DS, DA DSP, DAP series      

For information on the later Westinghouse (1960-1990), ABB (1990-2002), and Elster (2002-present) meters, refer to the modern meters section.

Return to the Watthour meter page