"Richard Clark" wrote
...
On Sun, 31 May 2009 21:08:22 +0200, Szczepan Bia?ek
wrote:

But do you know what the electricity was like in the
Maxwell theory from 1865?

It employed 20 equations with 20 unknowns. Can you name THREE?

Let's skip that, because you can not, of course.

It was recast as quaternions - I won't ask the impossible from you to
state TWO.

You have yet to manage how long it took for ONE electron to travel
end-to-end on Hertz's first loop.

So answering your questions is like sending Cuisinart to Darfur. Do
you know what electricity is like there? Any year?

"1861 - Maxwell publishes a mechanical model of the electromagnetic field.
Magnetic fields correspond to rotating vortices with idle wheels between
them and electric fields correspond to elastic displacements, hence
displacement currents. The equation for now becomes , where is the total
current, conduction plus displacement, and is conserved: . This addition
completes Maxwell's equations and it is now easy for him to derive the wave
equation exactly as done in our textbooks on electromagnetism and to note
that the speed of wave propagation was close to the measured speed of light.
Maxwell writes, ``We can scarcely avoid the inference that light in the
transverse undulations of the same medium which is the cause of electric and
magnetic phenomena.'' Thomson, on the other hand, says of the displacement
current, ``(it is a) curious and ingenious, but not wholly tenable
hypothesis.''

"1864 - Maxwell reads a memoir before the Royal Society in which the
mechanical model is stripped away and just the equations remain. He also
discusses the vector and scalar potentials, using the Coulomb gauge. He
attributes physical significance to both of these potentials. He wants to
present the predictions of his theory on the subjects of reflection and
refraction, but the requirements of his mechanical model keep him from
finding the correct boundary conditions, so he never does this calculation."
From: http://maxwell.byu.edu/~spencerr/phys442/node4.html

Try understand: "the mechanical model is stripped away and just the
equations remain."

Now engineers are using model with compressible, massive electrons. The
equations are used by teacher to teach the math.

According to Maxwell model the radio waves are transversal. Are such in your
radio reality?

S*
73's
Richard Clark, KB7QHC