Disc meter made by the Hersey Manufacturing Company in Boston, Mass. Hersey introduced the form in 1919, and 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.” The serial number (1,669,637) on this example dates from 1936. The case has been partially cut away to show the mechanism.
Ref: Hersey Disc Water Meter. Model H.F. Meter (July 1, 1926).
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