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Title: Principles Of Automatic Controls
Author: R. m. Hemfelt
Source: 1945 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1945
Abstract: By definition automatic means sell moving, regulating done from force of habit, or done by self acting machinery. Likewise, the dictionary states that control means to exercise a directing or restraining influence over some action, process, etc. Therefore, applying those definitions to the subject Principles of Automatic Controls we find that we are to study some of the basic principles of self acting machinery that has been designed to exercise a directing and restraining influence on some process variable.

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