[GreenKeys] Harmonic Analyzer -- Fourier analysis/synthesis using gears, cams, levers, springs, and the kitchen sinc

[Jordan Spencer Cunningham]

I love engineerguy. I wish he made more videos.

These machines remind me of Babbage's Difference Engines and Analytical
Engine, which were designed in the 19th century but never actually built
until recently (that is, Difference Engine 2 was built within the last few
decades for the first time, though the Analytical Engine is still just on
paper).

https://www.youtube.com/watch?v=be1EM3gQkAY
https://youtu.be/BlbQsKpq3Ak

And I thought teletypes or my Burroughs mechanical adding machine were
complicated!

It's incredible what people were able to do with mechanical or
electromechanical machines (teletypes included). It took some absolutely
genius engineering.

--Jordan

On Thu, Jun 14, 2018 at 3:52 AM, Paul Heller <paul0926 at comcast.net> wrote:

> Wow Gil. That was something. That machine offers a full semester of high
> school physics: levers, gears, springs.  And the fact that the pen
> orientation affects the way the plot is drawn (near the end of the
> operations video) certainly must be college level physics!
>
> Thanks for sharing. I’ve watched his other videos in the past and they are
> all interesting to me.
>
> Paul
> W2TTY
>
> ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY
> <HTTP://internet-tty.net:8000/ITTY>
> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
> <HTTP://internet-tty.net:8030/AUTOSTART>
> EUROPE: HTTP://INTERNET-TTY.NET:8040/EUROPE
> <HTTP://internet-tty.net:8040/EUROPE>
>
> On Jun 14, 2018, at 6:43 AM, Gil Smith <gil at baudot.net> wrote:
>
> From a bit of dsp research I have been doing lately I ran across this
> amazing machine designed in the late 1800s.  There are more videos, but
> these two short ones show the main points:
>
> "Synthesis" is the combination of sine/cosine waves in a linear system to
> generate a specific waveform:
> https://www.youtube.com/watch?annotation_id=annotation_
> 2259796885&feature=iv&src_vid=NAsM30MAHLg&v=8KmVDxkia_w
>
> "Analysis" is the decomposition of a waveform into the frequency-domain
> (eg: spectrum analyzer):
> https://www.youtube.com/watch?annotation_id=annotation_
> 2259796885&feature=iv&src_vid=NAsM30MAHLg&v=8KmVDxkia_w
>
> A pretty cool bit of mechanical engineering indeed.
>
> gil
>
>
> gil smith, AF7EZ
> greenkeys moderator
> gil at baudot.net
>
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