Type MF (1934 to 1936) Previous
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Along with the singlephase version, Duncan introduced a redesigned polyphase meter in 1934. One unique feature introduced on this series of meters was an electromechanical device connected in series with the voltage coil (instead of the normal low-wattage bulb operated from a winding on the voltage coil) that indicated whether or not that voltage coil was energized. This series of polyphase meters was only available in A-base (like the Sangamo HF polyphase). Duncan MF polyphase
Watertown Municipal Utilities collection