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Re: Hertz was: Re: Breakdown voltage at submillimeter distances?
Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 08:34 AM 4/12/2006, you wrote:
Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>
Hi Dr,
Thanks. After an other poster posted a link to an induction coil driven
Hertz experiment.
I attempted to verify that Hertz had indeed used "Lyden" jars with a Google
search and failed.
When I used the correct spelling I found that some of his experiments where
done with Leyden jars. In addition an Oliver Lodge of University College in
Liverpool England discovered waves on lines with them see
http://www.antiquewireless.org/otb/lodge1102.htm. He was experimenting to
explain some of the strange paths lightning some times takes. I had no idea
that my home town was so connected with the discovery transmission line
waves. I don't remember ever having read about him before. Apparently Hertz
just beat him to publication.
I also notice that some of Hertz's experiments apparently where performed
with GHz frequencies judging from the size of the dipoles. Surprising for a
spark gap generator.
The usual Hertz demo used a 2.5m dipole -> 5m wavelength -> 60 MHz
But you're right, some were at higher frequencies.
But as far as spark gaps and really high frequencies.. J.C.Bose
worked at 60 GHz (that's Giga!, as in 5mm wavelength) using sparkgaps
in a tuned cavity. This was in the 19th century. Google will find a
nice article about it, with photos of his equipment: polarizers made
from railway timetables, detectors, etc.
Robert (R. A.) Jones
A1 Accounting, Inc., Fl
407 649 6400