Trident Style 3 Water Meter

This is a disc water meter that fit a 2” pipe, and that was made by the Neptune Meter Company in Long Island City, New York. The Trident was based on designs patented by John Thomson, a prolific inventor and member of the American Society of Civil Engineers. In 1907, Neptune described the Style 3 as the “only meter that can be adjusted for different pressures.” Later trade literature noted that this model was designed for intermediate use, between “the usual house service, requiring but a small volume at moderate rates of flow and that of a manufacturing plant or similar service requiring a larger flow of water.”
Ref: Neptune Meter Company ad in Journal of the New England Water Works Association 21 (1907): vi.
Neptune Meter Company, Trident Meter Price List (1942), p. 5.
Object Name
water meter
date made
Neptune Meter Company
Physical Description
brass (overall material)
overall: 11 3/4 in x 12 in x 17 in; 29.845 cm x 30.48 cm x 43.18 cm
place made
United States: New York, Queens, Long Island City
ID Number
accession number
catalog number
Water Meters
Measuring & Mapping
Natural Resources
See more items in
Medicine and Science: Physical Sciences
Water Meters
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
A.A. Hirsch

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