I didn't open the link, but we used to use old carbon-mic phone
handsets for our gate judge reporting up and down the river bank when
we'd organize Whitewater Slalom Races down in Arkansas.  You'd
basically string a long length of 18 ga. speaker wire down the ban
where no one would trip over it(as as we learned the hard way, no
armadillos would chew threw the wires if left too close to the
ground).  We'd charge the carbon particles wit ha 12v car battery,
but a simple 9V Energizer battery would do as well.  There was a
simple modification to the wiring inside the phone and all the
handsets were in series in the loop and you had an instant party line
where the start and finish could get the stopwatches started for
timing and the other 5=6 phones in the line could call in gate
penalties to the scoring table and then quickly post the scores by
the time the paddler got back up  from his or her race run.  I've yet
to see a high tech version of this system work any better or more
efficiently.  If the phones quit working, usually all it took was a
few sharp raps on a nearby rock to get the carbon particles working again.

I love shade tree engineering

DM&FS

At 10:08 PM 6/8/2012, Alistair Bell wrote:
>I like it. I found 2 puke green phones in my stepfather's workshop
>that would add that "doofus hipster" look to my van. Wall mount
>phone for back seat, mounted on wardrobe would be better though.
>
>alistair
>
>
>On 2012-06-08, at 6:46 PM, Tom Hargrave wrote:
>
> > This guy wired up a set of old phones in his air cooled Westy!
> >
> >
> http://hackaday.com/2012/06/08/using-old-phones-as-an-intercom-in-your-vw-bu
> > s-or-anywhere-else/
> >
> >
> >
> >
> >
> > Thanks, Tom Hargrave
> >
> > <http://www.stir-plate.com> www.stir-plate.com
> >
> > <http://www.towercooler.com> www.towercooler.com
> >
> > <http://www.kegkits.com> www.kegkits.com
> >
> > www.grow-sun.com