Re: Hertz was: Re: Breakdown voltage at submillimeter distances?

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Original poster: Ed Phillips <evp@xxxxxxxxxxx>

   Neat work!  What are the details of the induction coil?  As for 
observing the tiny sparks I seem to remember that he was pretty much 
in total darkness to see that.  I've built similar but much cruder 
apparatus working at a wavelength of about a meter but I cheated and 
used a neon tube as the detector.  The setup consisted of a pair of 
rods with spherical spark gap at the center but no end loading and 
with it and the neon tube detector it was easy to demonstrate 
interference effects and reflections.

Ed

> > Has any one seen Hertz's experiments repeated or tried to repeat them i.e.
> > with just a metal loop and a gap for the receiver.
>
>
>
> I have :->
>
> A couple of years ago I built a replica for the Danish Electricity Museum.
>
> Hertz`s original stuff us seen here at Deutche Museum
>
> http://home5.inet.tele.dk/f-hammer/Hertz3.JPG
>
> Here is my interpretation of it:
>
> http://home5.inet.tele.dk/f-hammer/hz1.jpg
>
> And another view.
>
> http://home5.inet.tele.dk/f-hammer/hz3.jpg
>
> During the experimentation that led me to the final design, it 
> occurred to me, that Mr. Hertz probably was working in rooms that 
> were only lit by candles or the like, because the spark is only 
> visible in low intensity light.
>
> http://home5.inet.tele.dk/f-hammer/hz7.jpg
>
> An experimenter working in a modern, well lit lab would probably 
> overlook the arc in the receiving circuit.
>
> Cheers, Finn Hammer