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Title: Rotary Displacement Gas Meters
Author: F. F. Bogardus
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: The rotary positive displacement type meter has been widely used for gas measurement for approximately twenty years, its initial use in measuring unpuriiied manufactured gas gradually spreading to all types of gas measurement. While this is a comparatively short period of time compared to tlie length of time some types of meters have been used, tlie rotary displacement theory for Ijoth measurement and pumping dates back a good many years. As early as 1868 this principle was employed by two brothers, P. H, and F. M. Roots, of Connersville, Indiana, in an attempt to develop a two-impeller type water wheel as a substitute for the undershot water wheel. Indifferent success attended the efforts of the would-be inventors in this attempt, but eventually the use of this theory for measurement purposes resulted, the first meters of the two-Iobed rotary displacement type being used for liquid measurement. Some years later, it was realized this theory could be employed not only in the measurement of liquids but also in the measurement of gas, and in 1022 a number of gas meters of the two-impeller rotary displacement type w-ere installed in manufactured gas plants to measure the plant output. It was only a short time until this type of meter was used almost universally for station metering and as natural gas became available in the industrial centers, the meters were used for measuring large industrial loads, transmission line service, and city gate measurement.

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