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Title: Installation, Operation And Maintenance Of Automatic Chart Changers
Author: Richard L. Howard
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: The use of automatic chart changers have become so widespread throughout the natural gas industry that several transmission companies have standardized on changers. Automatic changers are as accepted in station design as orifice fittings, meter tubes, and orifice meters. Such has not a l ways been the case. Before 1958, there was no commercially available automatic chart changer. Several attempts had been made but none were available to the industry. In 19 57, Mullins Manufacturing Company was formed for the express purpose of offering the industry an automatic chart changer. A Patent Pending was purchased, design was tested and retested, redesigned and retested. Finally a design emerged that would change charts reliably and which could be manufactured commercially. The name chosen for this automatic chart changer was Dial-OGraph. The first commercial installation of a Dia 1-O-Graph was accomplished in January of 1959.

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