Thomson Polyphase meter, rectangular pattern (1899 to 1905) Up
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This meter (also known as the Form DF-2) was GE's first attempt at a induction-type polyphase meter. This meter was massive (twice as wide as the Thomson Recording Wattmeters) in order to space the two stators far enough that they would not interact with each other. This meter used construction very similar to the Form C-4 and High Torque meters, including the platform that supported the parts around the large disk's circumfrence. Because of the electric industry's desire for a more compact polyphase meter (and Westinghouse's successful introduction of the polyphase Round Type), this model disappeared into obscurity. Form DF-2 polyphase
Electrical Meterman's Handbook