In a previous paper Airy’s contributions to control theory were reviewed, and the developments in control which led up to Airy’s 1840 paper were summarized. The present paper continues the investigation into the history of control theory, and is mainly concerned with Maxwell’s paper of 1868. A preliminary background study deals with the development of integral control during 1837–1868. Then an expanded version is given of Maxwell’s rather terse exposition of stability of speed control systems.

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