This is a compound meter that joins a torrent meter, Model T, and a disc meter, Model FF. The Hersey Manufacturing Company introduced the form in 1914, and later described it as “a special meter in which Current and Positive Displacements Meters are combined with an Automatic Differential Valve for the purpose of accurately measuring a larger range of flow than can be accomplished by either meter separately.” The torrent meter in this example has a capacity of 160 gallons per minute; the disc meter has a capacity of 20 gallons per minute. The serial number (1,325,762) dates from 1928.
Ref: Hersey Manufacturing Company, Hersey Compound Water Meter (July 1, 1926).
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