Empire Type 7-AAX Water Meter

This is an oscillating piston water meter with a split case, the top of brass and the bottom of cast iron, and serial number 1,833,790, that was made by the National Meter Company in Brooklyn, New York. The Type-7 has a deep iron base designed to neutralize the galvanic action that might occur in some chemical-laden waters. AAX designates a linear register.
Object Name
water meter
date made
ca 1910-ca 1941
National Meter Company
Physical Description
brass (top material)
cast iron (bottom material)
place made
United States: New York, Brooklyn
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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