Disc water meter with a "2 TRIDENT STYLE 3" inscriptions. It was made by the Neptune Meter Company in Long Island City, New York, and fit a 2” pipe. It 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.
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