shelf for the science of feedback and control, from Maxwell's governors to the histories written since 1990. In date order. Every DOI was checked against Crossref; books are standard editions, and free copies are linked where they exist. The notes are our summaries, not quotations.

in the tour: the room called "Governors and feedback" has a placard called "Grey Walter’s tortoises" ···

1. Maxwell (1868). On governors. Proceedings of the Royal Society of London. doi:10.1098/rspl.1867.0055
   The first stability analysis of a feedback controller: write the governed engine as differential equations and ask when its oscillations die away. Used in: archive page
2. Routh (1877). A Treatise on the Stability of a Given State of Motion, Particularly Steady Motion. London: Macmillan. Scanned at the Internet Archive. archive.org/details/treatiseonstabil00routuoft
   The general algebraic criterion for stability of linear systems, still taught as the Routh array. Used in: timeline
3. Ashby (1940). Adaptiveness and Equilibrium. Journal of Mental Science. doi:10.1192/bjp.86.362.478
   Ashby's first statement that adaptation is a kind of stability: the seed of the homeostat. Used in: Ashby
4. Rosenblueth, Wiener & Bigelow (1943). Behavior, Purpose and Teleology. Philosophy of Science. doi:10.1086/286788
   Behaviour, purpose and teleology: purposeful behaviour defined as behaviour controlled by negative feedback. Short and still argued over. Used in: archive page
5. McCulloch & Pitts (1943). A logical calculus of the ideas immanent in nervous activity. The Bulletin of Mathematical Biophysics. doi:10.1007/BF02478259
   Neurons as threshold logic units, and nets of them as computers. Hard going; the foundation of neural networks. Used in: McCulloch
6. Wiener (1948). Cybernetics: Or Control and Communication in the Animal and the Machine. Paris: Hermann; Cambridge, MA: Technology Press; New York: Wiley.
   The book that named the field. Uneven, mathematical in places, and widely read. Used in: Wiener
7. Taylor (1950). Comments on a Mechanistic Conception of Purposefulness. Philosophy of Science. doi:10.1086/287106
   A philosopher's objection that the 1943 definition of purpose is both too broad and too narrow. Used in: archive page
8. Ashby (1952). Design for a Brain. London: Chapman & Hall. The 1954 Wiley printing is scanned at the Internet Archive. archive.org/details/designforbrain00ashb
   Design for a Brain: ultrastability, worked out with the homeostat as its example. Used in: the homeostat
9. Walter (1953). The Living Brain. London: Duckworth.
   Grey Walter's book on the brain, with his account of two small electromechanical tortoises whose simple circuits produce surprisingly lifelike exploring behaviour. Used in: the homeostat
10. Ashby (1956). An Introduction to Cybernetics. London: Chapman & Hall; New York: Wiley. Scanned at the Internet Archive. archive.org/details/introductiontocy00ashb
    The textbook: sets, transformations, variety, and the law of requisite variety. A free copy is on archive.org. Used in: Ashby
11. Wiener (1960). Some Moral and Technical Consequences of Automation. Science. doi:10.1126/science.131.3410.1355
    Wiener's warning in Science that machines which learn may pursue the stated goal rather than the intended one, faster than anyone can correct them. Used in: specification gaming
12. Conant & Ashby (1970). Every good regulator of a system must be a model of that system. International Journal of Systems Science. doi:10.1080/00207727008920220
    Every good regulator of a system must be a model of it: a slogan with a proof whose reach is disputed. Used in: glossary
13. Heims (1991). The Cybernetics Group. Cambridge, MA: MIT Press.
    The history of the Macy conferences, from interviews and archives; sympathetic and critical at once. Used in: timeline
14. Galison (1994). The Ontology of the Enemy: Norbert Wiener and the Cybernetic Vision. Critical Inquiry. doi:10.1086/448747
    Cybernetics read through Wiener's wartime anti-aircraft predictor and its picture of the enemy as a servomechanism. Used in: archive page
15. Dupuy (2000). The Mechanization of the Mind: On the Origins of Cognitive Science, trans. M. B. DeBevoise. Princeton: Princeton University Press.
    Cybernetics as the forgotten origin of cognitive science. Used in: timeline
16. Pickering (2010). The Cybernetic Brain: Sketches of Another Future. Chicago: University of Chicago Press.
    The British cyberneticians (Walter, Ashby, Beer, Pask) as builders of machines that adapt rather than represent. Used in: Ashby
17. Kline (2015). The Cybernetics Moment: Or Why We Call Our Age the Information Age. Baltimore: Johns Hopkins University Press.
    How cybernetics and information theory rose and fell in American science and popular culture. Used in: timeline

see also

	timeline: cybernetics — the same story by date
	purpose — a fragment from the reading room
	the homeostat — the machine