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Title: Automatic Chart Changers
Author: Bruce J. Caldwell
Source: 1977 International School of Hydrocarbon Measurement
Year Published: 1977
Abstract: Automatic chart changers are intended to overcome the necessity of routinely retrieving circular charts from recording locations at fixed time Intervals, consistent with each 30 of chart rotation. Also, chart changers are a means of upgrading circular chart recorders to the attendance level of strip chart recorders, without sacrificing the obvious convenience of individual charts for specific segments of time, such as an nour, day or week.

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