Keystone Compound Water Meter

This is a compound water meter that fit a 2” pipe. The Pittsburgh Meter Company introduced the Keystone meter in 1901, and the Pittsburgh Equitable Meter Company was still producing it in the late 1930s. The serial number (1,648,433) suggests that this example was made in the late 1920s. Pittsburgh Equitable explained that this model “consists of a combination of two units for measuring both the large and small flows of water, together with an automatic valve mechanism for controlling both flows so that the small flows will automatically pass through one unit and the large flows through the other unit at exactly the proper time and with as slight absorption or loss of pressure as possible.”
Ref: Pittsburgh Equitable Meter Company, Keystone Compound Water Meters. Eureka ‘A’ Water Meters, Bulletin W-502 (1929).
Object Name
water meter
date made
late 1920s
Physical Description
bronze (overall material)
overall: 13 in x 14 in; 33.02 cm x 35.56 cm
place made
United States: Pennsylvania, Pittsburgh
ID Number
accession number
catalog number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Water Meters
Natural Resources
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
A.A. Hirsch

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