On Tue, 26 Aug 2008 02:55:16 -0700 (PDT), Weatherlawyer
wrote:

You wouldn't happen to be a troll called Dawlish perchance?

No. Why would you think I am a troll anyway. Should I be insulted?

If or if not so, here is something you may or may not like answers to
or know or not know the answers to:

http://en.wikipedia.org/wiki/Von_K%C..._vortex_street

Stuff on there about the fish-tail way that fluids behave when an
obstruction causes pressure changes in the fluidity of said fluid.

Thanks for the link, I found it interesing and informative too.

The molecules hit the barrier and dam up. The dam bursts and a drop in
pressure takes place.

Yup. pretty much why airplanes fly.



Physical deformities are introduced and physical changes take place in
the stream. If it is air heavily laden with water at the dew-point,
for example, precipitation may occur.

As the air pressure drops, adibatic cooling occures. If the parcel
being cooled containes sufficent moisture, clouds will form and
precipitation may occur.


Is this a form of channeling or is it more likely to be the end
product of channeling?

Yes and yes.


Do you know enough about fluid mechanics to comment on whether the so
called dimensionless numbers used in it, resemble the articulation of
shapes in trigonometry?

not really

For the uninitiated:
One such number is taken on by the above phenomenon to dictate the
windspeeds / wire length temperature deformations and air pressures
required to make telegraph wires "sing".

An at home expirement to illistrate what your saying is use a
rubberband and blow accross it. Streach it for a higher pitch etc.

Thanks for bringing up some interesting concepts.



It obviously varies with wind speed and the lengths of the wires
between poles.

But also obviously varies with the mass of the wire and the tension of
it as well as the mass of the air at any particular time.
/for the uninitiated.