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Title: Domestic Meters
Author: J. L. Pond
Source: 1969 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1969
Abstract: Most volume measuring devices in current use utilize the positive displacement principle of measurement. In positive displacement measurement, an accurately known volume is alternately trapped and released and the number of trapping cycles is recorded on a register calibrated in the desired measuring units. According to this definition, a grocer measuring a pound of jelly beans is utilizing positive displacement measurement. A dairy filling quart milk bottles is also utilizing the same basic principle. And, over forty million gas meters in current use in the United States also are based on a positive displacement principle.

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