L (1937 to 1941) Previous
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In 1937, as part of continuing standardization of polyphase meters, Sangamo introduced its L line of 2- and 3-stator polyphase meters. As with Duncan's MG and GE's V line of meters, these meters used a single disk to reduce the meter's size to where they could be produced in a new socket-type version in addition to the bottom-connected (A-base) style. To reduce interference between stators, the L2 had slots near the edge of the solid disk while the L3's disk was laminated. The L3 was a milestone in metering history as it was the first successful 3-stator polyphase meter to use a single disk. As was common with other meters with steel brake magnets, the L's magnet was mounted on a shoe that could be adjusted in and out unlike the previous Sangamo polyphase models that used a fixed magnet. As with the HF singlephase, the local ID tag holder was eventually moved from the register to the nameplate (early L meters have a nameplate that looks like a D on its side). L2A network meter
David Dahle collection