Type OB polyphase (1924-1941) Previous
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This series of polyphase meter was based on the OB singlephase meter and were made in various 2-stator and 3-stator configurations for the polyphase circuits in use at the time. The meter shown was developed for use on 3-wire network circuits (like GE's I-18), and the polyphase version has a terminal chamber wider than the rest of the base. OB network
Photo by Bud Russell