Talking about the sound. Has anyone enquire about the old gramophone, when
the twirled and roughly parabolicaly opening sound guide tube amplifies the
record vibration input? No additional amplifying energy required? Does not
that sound like Keely's childhood motion machine made from cone shells?
Regards Slavek.
Jerry W. Decker wrote:
> Hi Joseph et al!
>
> I was wondering how long it would be before someone
> mentioned that....<g>...flame speakers have been around
> since the 1800's....after all, flame is ionized so by
> using an electrostatic modulation, its a simple
> matter to jerk it back and forth at audio rates.
>
> They were even sold commercially as speakers back in the
> 1960's/1970's...I used to know a lawyer who had a pair
> he paid something like $1500 for them...they used propane
> gas to produce a flame, had two electrostatic deflection
> plates and a cavity to reflect the sound....the response
> is said to be from 0 up to light...<g>...I never heard
> them in operation.
>
> I don't the efficiency of those would be sufficient to
> fulfill the needs of the original post...everything
> resonates to every frequency, but is most efficient when
> near resonance....so even piezo transducers can carry all
> the frequencies you would need and would of course have
> a 'Q' at their maximum resonance.
>
> The Chladni tables, akin to the early 'eidophones', had
> sound sung or spoken into a horn that focused the sound
> onto a plate so it could vibrate and move sound and form
> the beautiful geometries now called 'cymatics'...so a
> speaker under such a surface or a piezo affixed to it
> could be driven to produce the many fascinating patterns.
>
> Of course one or more FIXED tones will generate very stable
> geometries although altering their relationships to each
> other will produce motion and even patterns such as swirls,
> expansion, etc...as so beautifully shown by the late Dr.
> Hans Jenny and more recently by Russian scientist Dr. Yuri
> Ivanov as posted here;
>
> http://216.60.190.54/spider/b-100e.htm
>
> another related post (after a fashion);
>
> http://www.escribe.com/science/keelynet/index.html?mID=2350
> t
>
> There are many marvelous ideas and devices that have long
> been lost or forgotten....such as 'musical fountains' where
> water jets spray at audio rates to make music simply as
> long as the fountain runs.
>
> Joseph Hiddink wrote:
> >
> > I remember reading something about the "Singing
> > Flame" in old Radio/Electronics magazines, and
> > that was already in the twenties or thirties. I
> > believe I read it in Hugo Gernsback Magazine.
> > So, how come that Nasa invented that?
> > Joe Hiddink vliegschotel@yahoo.com
> >
> > --- MILLENNIUM PROJECT <infonet@home.com> wrote:
> > > I searched nasa's site and couldn't find
> > > anything about flame speakers.I
> > > found one page with a definition of a flame
> > > speaker.Nothing else
> > > yet.Heres the page I found
> > >
> > http://www.exploratorium.edu/xref/exhibits/flame_speaker.html
> > > This website has some intresting index.
> > >
> > >
> > ----------------------------------------------------------------------
> > > Warren writes:
> > > Yes, that is it. I will try and find my files
> > > on it and cut you a
> > > copy with diagrams. E-mail me if I should
> > > forget.
> > >
> > >
> > >
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