This is a disc meter of the sort that the Hersey Manufacturing Company introduced in 1919. Hersey described it 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—was the smallest of three sizes made. The serial number (864,882) dates from 1920.
Ref: Hersey Manufacturing Company, Hersey Disc Water Meter. Model H.F. Meter (July 1, 1926).
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