The Hersey Manufacturing Company introduced this type of disc meter in 1901. The firm described it as a “positive displacement meter of the nutating type” that was compact, accessible, able “to do a large amount of service at the lowest possible cost, and “adapted for use on all services where accuracy, reliability and durability are required.” This example—a ⅝” meter with a capacity of 20 gallons per minute—was the smallest of several sizes made. The serial number (321,930) dates from 1908.
Ref: Hersey Manufacturing Company, Hersey Disc Water Meter. Model F Meter (July 1, 1926).
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