MG series (1936 to 1950) Previous
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In 1936, the MG series superseded the MF series, with two important changes: The retarding magnet was now made of Alnico and the sealing studs for the cover were eliminated. This was also the first model by Duncan to use a laminated disk which allowed for a reduction in the meter's size. This allowed the two-stator network and polyphase meters to be produced in a socket-type version (the 3 stator versions were only made in A-base). However, the stators were arranged front and back and not side by side like the other manufacturers' models, and problems from this design may have been a reason Duncan went back to a multi-disk meter with the following MH line of meters. The MG series now had a clearer designation which included the type of service and the type of base on these meters: socket, A-base (network only), and polyphase A-base ('P' designation). The 'reinforced' terminal cover used on the polyphase A-base meters is unique to Duncan.
 
Duncan MG-2P
Photo by Marlow Galbraith
Duncan MG-3P
Watertown Municipal Utilities collection