[vcf-midatlantic] vacuum tube computers

Joseph S. Barrera III joe at barrera.org
Mon Dec 4 23:57:54 EST 2017

> Correct order
> Speed/velocity (integral of acceleration)
> Acceleration (acceleration = force/mass)
> force

derivative by time of position is velocity
derivative by time of velocity is acceleration
derivative by time of acceleration is sometimes called "jerk"

And then if you want to incorporate mass:

derivative by time of momentum (= mass x velocity) is force (= mass x

On Mon, Dec 4, 2017 at 4:49 PM, David Gesswein via vcf-midatlantic <
vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:

> On Mon, Dec 04, 2017 at 02:51:27PM -0500, Neil Cherry via vcf-midatlantic
> wrote:
> > Would analog computers have be used in control systems where feed back
> would
> > be use. I can't quite recall those classes anymore (I haven't needed them
> > since the early 80's).
> >
> I think like all terms analog computer get fuzzy when you try to categorize
> particular objects. Previously we were discussing more of general purpose
> programmable analog computers which were used to model/solve problems.
> I would call the analog proportional integral derivitive (PID) controllers
> that were/are used a lot for process control analog computers. The PID
> coefficents were normally adjustable for the particular application but
> the general function implemented was not. I would not call just having
> feedback
> an analog computer. An op-amp wired up as a unity gain follower has
> feedback
> but I wouldn't call it an analog computer. V2 = V1 is a little too
> simple to call computing.
> > Also my Calculus professor gave us an example of Calc used daily. I can't
> > quite recall all of it but something like
> >
> > Acceleration
> > Speed
> > force
> >
> > I think that you can derive the next from the later. I'm sure there are
> > other examples of where we actually use these formulas without realizing
> > it.
> >
> Correct order
> Speed/velocity (integral of acceleration)
> Accelleration (acceleration = force/mass)
> force

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