This is a disc water meter with split case and no serial number, that fit a ⅝” pipe. The brass case is marked “SPECIAL.” The cap is marked “THE LAMBERT M.F.D. BY THOMSON METER CO.” The dial reads in ...

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 ...