H (1911 to 1914) Previous
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This model had been in development for some time before its introduction in early 1911 but Sangamo had to wait until the Tesla patents invoked by Westinghouse expired in late 1910. At the time, it was the smallest model on the market until the Westinghouse Type OB took that honor for keeps in 1924. This version can be told from the more common later version two ways: First, the base has three mounting flanges and the terminal cover has a raised border with the serial number right along the edge. At first, this model did not have a complete lag coil due to a patent that was still in effect, but as soon as the patent expired, Sangamo sent out literature describing how to connect the coil and calibrate the meter at 50% power factor. Sangamo H, early version
Electrical Meterman's Handbook