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Title: Positive Displacement Meters For Liquid Measurement
Author: Norman A. Alston
Source: 1990 International School of Hydrocarbon Measurement
Year Published: 1990
Abstract: The art of Liquid Flow Metering has taken many forms with varying levels of precision over the years. One liquid meter type known as the Positive Displacement Meter operates exactly as stated wherein an Exact or Positive known volume of liquid is contained or displaced sequentially and each segment or volume unit is counted. Therefore, Positive Displacement Metering qualifies as one of the oldest forms of liquid metering since any bucket, can, jug or jar could be classifiiad as a means of sequentially delivering a known liquid volume that can be counted even though the precision of the measurement may be in question.

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