The Hersey Manufacturing Company introduced this form in 1919, and described it in as a “positive displacement meter of the nutating type” that was “adapted for use on all services where extreme accuracy, reliability and durability are required and where general efficiency rather than first cost is of prime importance.” This example—a ⅝” meter with a capacity of 20 gallons per minute—is the smallest of several sizes made. The serial number (1,218,942) dates from 1926 but the flange is marked “10-20-27.”
Ref. Hersey Manufacturing Company, Hersey Disc Water Meter. Model H.D. Meter (July 1, 1926)
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