On Nov 16, 3:57*pm, (Richard Harrison)
wrote:
Art wrote:

"The fact that this old book is being republished by the publisher is to
obtain money and should not be seen of (as) verification of its
contents."

I`ve had both editions. They are identical in content (no corrections).
Terman says essentially the same things about "skin effect". Griffith`s
examples and drawings are more extensive.

Charges are moved to the surface by reduced inductive opposition there.

Imagine a wire made of many concentric layers. Each layer`s current
produces inductive opposition. This is generated by the current that
layer carries. The inner layer is encircled by all the lines of all the
layers while the exterior layer is encircled by only the lines generated
by its current and none from the lines generated by the current in the
layers under it. Thus, there is little inductive opposition to current
on the surface of the wires.

Best regards, Richard Harrison, KB5WZI

Thank you for that Richard. I suspected that such an old book as with
Terman
would not be abreast of the present times and still hanging on to
ideas that are
not in sync with the present day thinking. You surely must know that
a time varying field
upon a diamagnetic material also creates what is known as the Foucault
or eddy current field.
Present day non destructive material testing duplicate this method to
provide a means of looking for a crack or fissure in
materials often after heat treatment or welding. On a unimpared
surface the eddy current swirls
in a closed circuit form on the surface as a result of a applied time
varying current. Relly a reaction in terms of Newtons law.
If there is a crack or fissure in the surface the closed circuit of
the eddy current is broken and it is this that todays inspection
equipment relies upon.
Ofcourse this created magnetic field is in opposition to the applied
magnetic field and this opposition is called a skin effect.
It is called a skin effect because like the aplied current the eddy
current flows on the surface of a conductor and is limited in
penetration.
Ofcourse when this rotating magnetic field is combined with the main
magnetic field its rotary action makes short use of particles that
abide on the surface
where it supplies spin to the particle while excellarating the
particle in opposition to gravity. Ofcourse Richard your term in the
military taught you that a rifle has as groove that curls inside the
barrel which you know is to provide a spin to the bullet so that it
does not wobble end over end and thus lose its accuracy. The particles
by the way are sub atomic and so small that they can pass thru
retaining threads as it were on most materials so its mass and energy
content is quite small such that it will bounce off of rthe shields
surrounding our earth but not so much that it looses its resistance to
gravity before it finds a suitable radiature of resonance that it can
rest upon according to the direction aimed by the transmitter. It will
not deviate from this course if the receiving antenna is not directed
in substantially the same direction. Since there are a lot of these
particles around on Earth there is a scramble for a suitable place to
rest so any vacancy is immediately occupied such that radiation is a
huge lot of levitated particles. Fortunately the Sun keeps on burning
pushing particles away from its own gravitational field otherwise the
11 year cycle would become a century old plus cycle and we would look
for another hobby.Another thing Richard these particles are extremely
small so we will not finish up knee deep. On top of that they also
decay because of diminishing
nuclear content which we see the results of when there is a sun burst
and the clustered particles get into our power system and overloads
it.
Regards
Art Unwin.......KB9MZ.......XG (UK)