Invisible escreveu:
>>> When I looked at this device, "simple" wasn't what came to mind... ;-)
>>
>> Hehe yes, I'd never have thought you could make a spectrum analyser 
>> mechanically!
> 
> IIRC there is prior art in this direction - I saw a machine in the 
> London Science Museum that does this. Victorian, I think. I forget 
> exactly how it works; suffice it to say it seems "obvious" after you've 
> been told. ;-)

You mean Charles Babagge's Analytical Machine?

http://www.sciencemuseum.org.uk/images/I031/10301732.aspx

I'm sure you know the importance of Babagge's work that led to today's 
computers.  And Ada Lovelace...

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