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Title: Rotary Displacement Meters
Author: B. G. Iverson
Source: 1955 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1955
Abstract: The Roots-Connersville rotary displacement meter, as the name implies, accurately measures gas by rotary action of two figure eight shaped impellers that rotate within a stationary cylindrical housing. The metering compartment is formed by the side of one impeller, cylinder wall, and flat surfaced head-plates at the ends. Referring to Figure 1, as the right hand impeller rotates in a clockwise direction to a vertical position a definite volume of gas is displaced. As this impeller continues to rotate it releases a measured volume of gas thru the bottom opening of the meter. The impeller on the left hand side, rotating in the opposite direction closes to a vertical position confining another definite volume of gas. This operation is alternately repeated so that for one revolution there are four discharges from these measuring compartments.

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