Re: Flat conductors (was I need help).

[Bernard Cleyet <anngeorg@PACBELL.NET>]

I suggest using push pins to make the connection to the Ag dots or
disks.  Mine are irregular dots max. d. 1.8 mm.  After pushing them into
the dot, I added Ag paint to the "joint."

My intention was then to increase the dots to 10 mm and redo.    Filling
in the inner equipotential (which is oval) should make no difference,
while making a larger circle should.

bc


kowalskil wrote:

> "John S. Denker" wrote:
>
> > First of all, to keep things
> > from getting unreasonably complicated, I assumed that the
> > resistor paper was lying a distance L above a conducting

cut


> So why did the line shift with respect to what it was
> yesterday? This brings me to the question JohnM asked
> last night: what are the diameters of circles. The diameters
> are small; about 5 mm. But this does not count, I think.
> What counts is the 8 mm diameter "washer" sitting
> on top of each silver dot. The "washer" is actually the
> eye lead (1 mm thick) of the wire supplied by Pasco; wires
> are used to apply the DOP to the silver circles. The entire
> structure consists of the horizontal cork plate, the carbon
> paper and isolated wires connected to silver dots as
> described  above. It is not an ideal setup but that it is.
>
> It turns out that the exact location of the 187 V
> equipotential line near the margins (but not near the axis)
> is quite sensitive to the location of the eye lead. Moving it
> in the direction of another circle by as little as 1 mm moved
> the line endings in the same direction by about 1.5 cm. I was
> not aware of this. In order to measure the diameters of silver
> spots a I had to remove the washer and put it back again,
> apparently not exactly in the same position. That is why the
> line shifted. I moved the washer by 1 mm and the line
> became as it was (very nearly so). Yes, the devil is always
> present but we can often avoid his traps.
> Ludwik Kowalski