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

Thu Jun 14 19:54:45 EDT 2018

So many people, especially the young, feel mechanical engineering is 
obsolete and useless. It has the great advantage of demonstrating 
principles and operations in a form that is tangable and can be easily 
reviewed repeatedly until it is understood. With that knowledge  firmly 
established, there is some expectation of the results, and errors in 
converting the task to digital are more likely to be discovered.  Going 
directly to digital design in the abstract first without a solid basis 
is not always wise.  It is very unfortunate  the early IBM MARK series 
and other mechanical "computers" have been lost to the ages, I doubt 
even the drawings for them still exist. For  something quite complex and 
fascinating,  take the covers off a Marchant or Friden mechanical four 
function calculator and watch it in operation.

     Bruce Gentry, KA2IVY

On 6/14/18 5:24 PM, Jordan Spencer Cunningham wrote:
> 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 
> <mailto: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. Iï¿½ve watched his other videos in the past and
>     they are all interesting to me.
>
>     Paul
>     W2TTY
>
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>     On Jun 14, 2018, at 6:43 AM, Gil Smith <gil at baudot.net
>     <mailto: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
>>     <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
>>     <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 <mailto:gil at baudot.net>
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