Re: longitudinal waves

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Dave: I suspect I am just a bit older than you, 50+ years or so. I think I
should let you know that modern speakers are low impedance and will not work
on a crystal set. You will nead to make your own high impedance speakers
2-20k as they are no longer made. Even high impedance ear phones are hard to
get except surplus. You might try a crystal transducer or use an amplifier.
  Robert  H 

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Tue, 05 Mar 2002 20:11:54 -0700
> To: tesla-at-pupman-dot-com
> Subject: RE: longitudinal waves
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Tue, 5 Mar 2002 20:20:43 -07
> Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <dave-at-volantis-dot-org>
> 
> I've been working a lot on the physics of longitudinal waves so I can
> prepare experiments to conclusively prove their existence.  Tesla gave us at
> least one method of receiving longitudinal waves.  The method I would use is
> to string two long wires parallel to each other.  The longer the better.
> The wires should be spaced according to the frequency you wish to detect and
> perpendicular to the line of site to the signal source.  I'm going to use
> the power from a local radio station for my experiment, so I'll space the
> wires at a distance of an odd division of the AM radio frequency such that
> the first wire will receive the full compressed state of the wave while the
> other wire is receiving the full rarefied state of the wave.  In between at
> the midpoints of both wires will be connected a series resonant circuit
> tuned to the frequency of the radio station.  There should be enough current
> in the wires to drive a pretty loud speaker in a crystal radio set.
> 
> A couple days ago I was fiddling around with a large flat spiral coil and
> pumped signal generator current into it.  The outer lead was grounded.  I
> was able to generate a 2Hz wave in the coil such that I could watch the
> voltage rise and fall in the coil between 5 volts and 28 volts over about a
> 10 second interval.  Likewise, all frequencies generated by the signal
> generator produced similar effects.  I was impressed by the wide frequency
> range of the coil when connected in this manner.
> 
> The 2Hz wave was not longitudinal, but it does give me an idea that I might
> be able to do the longitudinal experiments with wound flat spirals.
> 
> The anti-static thread on this list has piqued my interest.  Having two flat
> spiral coils on a long plastic pipe, I could point this pipe in any
> direction, adjust the distance between the coils, tune the series resonant
> circuit between them, and pick up longitudinal waves from all directions
> quite easily.  (Provided the concept works.)
> 
> To test whether a flat spiral coil, or any coil, produces longitudinal
> waves, one of these devices can be tuned to the frequency of the coil.  If
> the coil is producing longitudinal waves, then there will be a significant
> amount of electrical movement received by the longitudinal receiver, but
> there will be little or no voltage.
> 
> For my ideas on how longitudinal waves are produced, you can check out my
> updated c^2 and Longitudinal Waves paper at
> http://www.tesla-coil-builder-dot-com/c2_and_longitudinal_waves.htm
> 
> In all fairness to the critics on this list, I will tell you that these are
> merely my theories and they are not scientifically substantiated nor even
> warmly welcomed, ....yet. :-)
> 
> But for now we need to learn about flat spiral coils and characterize them.
> 
> Dave
> 
> 
>