User:Mackerm/Testbed

Dynamic systems
The centrifugal governor is often used in the cognitive sciences as an example of a dynamic system, in which the representation of information cannot be clearly separated from the operations being applied to the representation. And, because the governor is a servomechanism, its analysis in a dynamic system is not trivial. Carl Wilhelm Siemens disparaged Watt's governor in his 1866 paper "On Uniform Rotation," saying:
 * the name of "governor" seems inappropriate, the instrument being, in fact, only a "moderator" of the amount of fluctuations to which the engine would be subjected without its agency.

James Clerk Maxwell cited Siemens in his famous 1868 paper "On governors" that is widely considered a classic in feedback control theory. Maxwell distinguishes moderators (a centrifugal brake) and governors which control motive power input. He considers devices by James Watt, Professor James Thomson, Fleeming Jenkin, William Thomson, Léon Foucault and Carl Wilhelm Siemens (a liquid governor).