Type C (1906 to 1911) Previous
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This meter had two major versions: In the early Type C, a stamped steel base was used and the terminal chamber used on the Type B was replaced with a porcelain terminal chamber recessed into the top of the main body of the meter. There are two variations of this style, the terminal covers using either screws or wing nuts. This arrangement was apparently inconvenient as Westinghouse soon reverted to the basic design of the Type B and continued with little change until the introduction of the OA meter. There are several variations of this second style, and they are shown below. The two in the middle are the most commonly found versions, but even these two styles are fairly scarce.
 
Type C, early version
Photo by Dale Sindelar
Type C, glass cover
Dale Sindelar collection
Type C, 2-wire high-capacity
Westinghouse handbook on Watthour Meters
 
Type C, bottom-connected
Westinghouse handbook on Watthour Meters
Type C, metal cover
Mark Zavislan collection
Type C, 3-wire high-capacity
Photo by Dale Sindelar