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Title: Fundamental Principles Of Measurement By Displacement Gas Meters
Author: A. F. Benson
Source: 1938 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1938
Abstract: npHE RECIPROCATING steam engine producing continuous rotation of a fly wheel was invented in 1781 by J. Murray Watts. The cycle or sequence of events, namely, the position of the valve relative to its seat, and the position of the piston relative to the crank as used in that engine are used in the modern steam engine. This same cycle is used in domestic and large capacity diaphragm gas meters. The steam engine mentioned above consists of a cylinder, piston, crank and valve mechanism. These parts are diagrammatically shown in the following slides. The gas meter consists of the same parts, but the forms of some are slightly changed. For example, the following slides, Fig. 1 to 4 inclusive, show a diaphragm replacing the piston of a steam engine. Now, for ease of construction and longer life, the diaphragm of a gas meter is normally located and of the shape shown in the slide, Pig. 1. We can see from this slide, then, that there are four measuring compartments, two being the portions inclosed by the diaphragm and the diaphragm disc, called the diaphragm compartment, FD and BD the other is the compartment inclosed by the case and outside of the diaphragm and its discs, called the case compartments, PC and BC.

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