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Title: Electronic Chart Scanning And Related Equipment
Author: Al Burr,L. G. Tidwell,M. L. Williams
Source: 1976 International School of Hydrocarbon Measurement
Year Published: 1976
Abstract: industry in 1960. Its speed and potential accuracy surpassed any existing equipment. The first model, with a digital computer, was very expensive and most companies felt it was not economically feasible to use. Later the computer was changed to an analog version, reducing the cost and making it more attractive to the industry. In 1970, the scanner was again redesigned. Integrated circuits were used to produce a scanner comparable in price to the analog version and having many improvements. Although more improvements have been made since then, the basic design is unchanged. Because the chart geometry is different on American, Foxboro, and Emco charts, a different scan station is required for each. A selector switch connects the desired station to the computer section.

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