Type OB polyphase (1924-1941)	Back	Up	Next
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.	Photo by Bud Russell