Re: longitudinal waves

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

Original poster: "Steve Greenfield by way of Terry Fritz <twftesla-at-qwest-dot-net>" <alienrelics-at-yahoo-dot-com>

Dave, if you can still find crystal earphones, they are very Hi-Z
and very sensitive. When I was young I got into making crystal
radios in every variety and a crystal earphone beat everything else
hands down, including 2K headphones.

What are you going to do to prevent normal EM pickup of the radio
waves? Two wires spaced 1/2 wavelength apart, oriented at right
angles to the source sounds like it'll pick up normal EM waves just
fine.

Steve Greenfield

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> 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