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Re: Where to get a horn
> > With that kind of pressure, you'd probably send the note a few stories
up
> > the harmonic series or even blast the horn off the roof :-)
>
> High power dog whistle???
>
>
> --
> Paul Jones
> http://pj_rail.tripod.com
> (Updated 23 May)
That's the idea
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Rgds
J. Boles
Sydney, Australia
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