Trident Water Meter

This is a disc water meter with a frost proof bottom and serial number 79,850 that fit a ⅝” pipe, and that was made around 1900 by the Neptune Meter Company. The bronze case is marked “TRIDENT.” The top of the cap is marked “NEPTUNE METER COMPANY NEW YORK 79850.” The inside of the cap is marked “PATENTED MAY 21, NOV. 1, 92 FEB 6 MAY 22 94 MAR 12 95 SEP 29 96 APR. 12 98 JAN 24 99.” The firm was founded in 1892. Its original product, the Trident water meter, was based on designs patented by John Thomson, a prolific inventor and member of the American Society of Civil Engineers. Neptune boasted in 1903 that “Nearly 165,000 Tridents” were then in use.
Ref: Neptune Meter Company, The Trident Water Meter (New York, 1895, 1901, 1903).
Currently not on view
date made
ca 1900
Neptune Meter Company
place made
United States: New York, Queens, Long Island City
Physical Description
brass (overall material)
overall: 8 in x 7 1/2 in; 20.32 cm x 19.05 cm
ID Number
accession number
catalog number
Credit Line
A.A. Hirsch
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Water Meters
Natural Resources
Data Source
National Museum of American History


Hello from Western Australia! I have found Neptune meter 'thing' beside the road outside where I live. It's called The Lambert ... looks like top of something. It is round 2.5 ins diameter. Product number L321025 dated 1927. That's it. If you have any questions please ask. Best wishes from Perth.

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