[time-nuts] D term (was no subject)
phk at phk.freebsd.dk
Mon Jan 26 15:15:12 EST 2015
In message <5E5E892CF8A2440FBF18FFAD000B65FD at NewComputer>, "Lee Mushel" writes:
>I'm fairly sure that Jim is right. I never had to worry about PID machine
>control before the late sixties and by the mid-seventies the concepts were
>firmly in place and in use.
The basic math of PID has been around for about 100 years. The invention
of the servo (and synchro/resolver) is what makes its day...
>>> Almost all mechanical "governors" er pure P.
>> Maxwell strikes again
>> definitely more than P controllers..
I said "Almost all"... :-)
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
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