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Title: Electronic Chart Reading Devices
Author: Alan T. Burr
Source: 1977 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1977
Abstract: A chart from an orifice meter serves little purpose Unless we have some means of transforming the graphic data recorded on it into a measure of volume. The differential and static pressure lines on the chart could be averaged visually at regular intervals to provide values for volume calculations, but this is a slow, tedious process subject to considerable error, especially for erratic charts. Mechanical planimeters make the task of chart calculation somewhat easier and more accurate than visual methods but still do not provide the speed and accuracy increasingly demanded by the gas industry. Electronic chart reading devices are being implemented more and more to satisfy this need.

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