Hertz experiment revisited (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 04 Apr 2004 22:19:47 +0200
From: Finn Hammer <f-h@xxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Hertz experiment revisited

All,

A while ago I babbeled about Heinrich Hertz`s experiment, and now I have
pictures of the interpretation of this experiment.
The pictures are taken at the Danish Electricity Museum, which I am
associated to, and shows:

Front view, the copper spheres are 300mm Ø / 12"dia:

http://home5.inet.tele.dk/f-hammer/hz1.jpg

A bit from the side, to show supporting structure:

http://home5.inet.tele.dk/f-hammer/hz2.jpg

Another view to show how the receiving antenna is bent, to bring it
closer to the transmitter. This was to ensure reliable performance.

http://home5.inet.tele.dk/f-hammer/hz3.jpg

This view shows the induction coil, and the main discharge balls. These
balls are tungsten carbide, 30mm Ø / 1 1/4"dia, and resting in copper
spoons, so that they can be rotated if they should get burned after some
use.

http://home5.inet.tele.dk/f-hammer/hz4.jpg

This pic shows the secondary discharge balls, also tungsten carbide,
12mm Ø/1/2"dia. resting in spoon shapes, to facilitate rotation instead
of tedious re-polishing:

http://home5.inet.tele.dk/f-hammer/hz5.jpg

When the indictor makes a spark in the main discharge gap, this spark
appears in the receiving circuit. 4.5mm is possible, but for reliable
operation in a Museum display, the gap is set at 3mm.

http://home5.inet.tele.dk/f-hammer/hz7.jpg

Cheers, Finn Hammer