The concept of feedback must be classed with the seminal ideas of the century, and has become, as Judson (1980) expressed it, “one of the chief themes of scientific understanding.” Actually, the idea was implicit in human technology long before the term “feedback” first appeared in print in 1920. Automatic feedback control devices were used in water clocks (Ctesibius of Alexandria, 3rd century B.C.) and later as regulators on furnaces (16th century) and governors on steam engines (Watt, 18th century). In the 19th century James Clerk Maxwell wrote the first paper describing the theory of feedback devices.
KeywordsPositive Feedback Negative Feedback Closed Loop System Loop System Blood Sugar Level
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