[time-nuts] Worlds first time code generator and ultimate decoder
celephicus at gmail.com
Mon Aug 11 19:52:00 EDT 2014
>> If your fingers ain't purple, you ain't doin' science...
A blast from the past, when the output was recorded as a line on paper. I
remember those recorders with pens that had to be filled from a bottle of
ink, purple and green were popular colours, and both stained your fingers.
As a bonus it was easy to perform integrations of the output over time.
Simply cut the roll along the recorded line and weigh the remainder on an
analytical balance, the ratio of the weight to an equal length of uncut
roll was the integral.
Tom Harris <celephicus at gmail.com>
On 12 August 2014 04:31, Don Latham <djl at montana.com> wrote:
> So who could afford Brush paper? I had hundreds of feet of adding machine
> paper (cheap!)
> If your fingers ain't purple, you ain't doin' science...
> Chuck Harris
> > It only appeared that way if you were using the wrong paper for the
> > chart recorder. Those that had needles that moved in an arc also had
> > chart paper that was ruled using lines in the "T" axis, and arcs in
> > the "X" axis.
> > -Chuck Harris
> > Max Robinson wrote:
> >> The issue of the recording stylus apparently moving backward along the
> >> axis
> >> shouldn't be a mystery to anyone who remembers the old Brush (brand
> >> galvanic
> >> chart recorders. The pen tip moved in an arc rather than rectilinear
> >> for slow
> >> paper movement the graph appeared to move backward in time. I have no
> >> exactly
> >> how virtual stylus works in decoding these recordings but it seems
> >> that they
> >> could account for the recording stylus being moved in an arc rather
> than a
> >> straight
> >> line.
> >> Regards.
> >> Max. K 4 O DS.
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> "The power of accurate observation is commonly called cynicism by those who
> have not got it."
> -George Bernard Shaw
> Dr. Don Latham AJ7LL
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