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The Origins of Feedback Control

Mayr, Otto

Verlag: The MIT Press, 1975
ISBN 10: 0262630567 / ISBN 13: 9780262630566
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Titel: The Origins of Feedback Control

Verlag: The MIT Press

Erscheinungsdatum: 1975

Zustand: very good


Gently used. Expect delivery in 20 days. Buchnummer des Verkäufers 9780262630566-3

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Inhaltsangabe: This is the first historical account tracing the development of the technology of feedback control from its earliest applications. The author describes how the notion entered technology and in what forms it flourished. A case study in the intellectual history of technology, the book spans the invention of feedback control devices in all degrees of realization, from the verbally expressed idea to the industrially proved apparatus. It starts out by establishing three criteria for a precise definition of the concept "feedback": (1) the system must carry out commands and maintains the controlled variable equal to the command signal in spite of external disturbances; (2) the system operates as a closed loop with "negative feedback"; (3) the system includes a sensing element and a comparator of which at least one can be distinguished as a physically separate element.

Ancient devices meeting these criteria are discussed in detail: the water clock of Ktesibios, Philon's self-regulating oil lamp, float devices by Heron, Arabic and Far Eastern inventions. These are followed by the first thermostatic ovens and incubators constructed in the seventeenth century, and steam-pressure and other regulators built in the eighteenth century, in both cases in Britain. The classical example is the governor of James Watt's steam engine. The evolution of speed regulators is traced through the nineteenth century, and the logical steps toward the developments of automation and cybernetics are discussed briefly.

The author also advances an interesting theory as to why feedback devices began to appear in quantity in the second half of the eighteenth century, and why mainly in Britain. In his view this was not so much a purely technological breakthrough or the result of the new demands created by the Industrial Revolution as it was a fundamental change in man's attitude toward machinery and toward systems in general: the system came to be regarded as autonomous, maintaining equilibrium by mechanisms inherent in itself. In technology, such thinking led to the invention of feedback devices; in economics, to the free enterprise system of Adam Smith; in politics, to the division of powers and the system of constitutional government.

Otto Mayr translated this book from his own German original.

Sprache: Text: English, German (translation)

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