[R-390] Interesting Speakers

[Barry]

I do recall an article in Popular Electronics back in the '60s about using
fire itself as a speaker.  Apparently the tension on the surface of the
flame could be caused to vibrate and act as a speaker.

I guess these wouldn't work very well in a cardboard enclosure, though :)

Barry - N4BUQ

----- Original Message -----
From: "2002tii" <bmw2002tii at nerdshack.com>
To: <r-390 at mailman.qth.net>
Sent: Saturday, January 14, 2006 11:46 AM
Subject: Re: [R-390] Another satisfied Ebayer? (sp corrected)


> Joe wrote:
>
> > Has anyone EVER seen even ONE speaker with anything
> > BUT a flamable paper cone????
>
> Let's see, in the 20 years I spent in the high-end hi-fi business, I saw:
>
> wood
> aluminum
> titanium
> beryllium
> kevlar
> bextrene
> impregnated fabrics
> phenolic composites
> mylar
> styrofoam
> glass fiber composite
> glass
> ceramic
> cork
>
> And that's just what I remember off the top of my head for coil-driven
> speakers of some size (4" or more).  Tweeters have used all kinds of
> things, including a gaseous plasma.
>
> Best regards,
>
> Don
>
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