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Title: Pittsburgh Equitable Displacement Meters
Author: R. F. Davisson
Source: 1939 Appalachian Gas Measurement Short Course
Year Published: 1939
Abstract: For the benefit of those not fully acquainted with the meter as a measuring unit, we will briefly discuss the theory of the meter as compared with that of the stream engine. Although the uses of the two different pieces of mechanical equipment are not alike, the construction of the two are almost identical, and the operation of the two are in many ways the same. We know that the engine is used to convert thermal energy to mechanical energy, which is accomplished by passing the steam into the cylinders, and this confined steam drives the pistons of the engine, and the pistons carry the energy to the desired location by crank and linkages. The essential portions of the engine are the cylinder, to contain the steam, and a series of valves, to permit the steam to enter the cylinders. Of course, it is plainly seen that these valves must act with the pistons so that the steam may enter the desired compartment at the desired time.

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