[time-nuts] D term (was no subject)

[Jim Lux]

On 1/26/15 5:55 AM, Poul-Henning Kamp wrote:
> --------
> In message <54C5A270.7090007 at earthlink.net>, Jim Lux writes:
>
>> And there's decades, if not centuries, of experience with P, PI and PID
>> controllers in a practical sense.
>
> Not quite a century I belive:  Only the advent of electronics formalized
> the theory and developed the practice.
>
> Almost all mechanical "governors" er pure P.
>
>


Maxwell strikes again

http://upload.wikimedia.org/wikipedia/commons/b/b1/On_Governors.pdf

definitely more than P controllers..

cups with liquid (Siemens governor), nonlinear mechanisms, etc.