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Title: Rotary Displacement Gas Meters
Author: F. F. Bogardus
Source: 1939 Appalachian Gas Measurement Short Course
Year Published: 1939
Abstract: The rotary positive displacement type meter has been widely used for gas measurement for approximately twenty years, its initial use in measuring unpurified manufactured gas gradually spreading to all types of gas measurement. While this is a rather short period of time, compared to the length of time some types of meters have been used, the rotary displacement theory, for both measurement and pumping, dates back a good many years. As early as 1868 this principle was employed by two brothers, P. H. and E. M. Roots, of Connersville, Indiana, in an attempt to develop a two-impeller type water wheel as a subsitute for the undershot water wheel.

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