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Title: Fundamental Principles Of Displacement Meters
Author: Merle J. Gallagher
Source: 1968 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1968
Abstract: A displacement meter, by definition, would be one that measures volume directly without regard to its temperature, pressure, or density. It does this by physically displacing a volume of gas by the action of the meter. We will consider in this paper how the gas meter, as used today, displaces this gas volume to make the meter operate, and at the same time, determine the gas volume that has passed through the meter. Although there have been many designs of gas meters over the last 100 years or more, the present day meter was brought forth by Thomas Glover in 1841. This meter is one that uses the familiar D-slide valve, 2 diaphragms with four compartments.

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