>> 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. ;-)

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