Round Type polyphase (1899-1903) Previous
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After Shallenberger's and Thomson's (GE) attempts at a workable polyphase meter, an engineer at Westinghouse (Paul McGahan) devised this polyphase meter which was simply two singlephase Round Type meters in a tall case with a common shaft and register. The terminals for this meter were on the back, at the top and bottom.
Polyphase Round Type
Westinghouse Handbook on Watthour Meters