On Wed, 05 Sep 2007 00:04:23 -0000, Jim Kelley
wrote:

Richard Clark wrote:

The description you offer requires a porous plate which is absent in
every radiometer that has come down the pike

On the other hand, the absence of porous plates in operating
radiometers tends to cast some doubt on your claim that the plates
must be porous.

Not "my claim," my report. The claim they must be porous arrives
through the math necessary to balance the kinetic forces. As that
math balance (from Einstein and Reynolds) has never been achieved,
then Denny's description has never been proven. Less than porous
vanes only further removes such "explanations" from the realm of
proof. In fact, as a description, Denny's is incomplete insofar as
there is no description of the turbulence created in the near vacuum
that serves as the "thrust" for the vanes which is missing in a
complete vacuum. The "thrust" is optimal only for porous plates, as
an explanation; and that explanation, as I've said, does not fully
balance.

Now, if we simply move to another radiometer (Nichols, Tear, Hull, and
Webb already recited) without that partial vacuum, the vanes still
move, and expressely by Radiation Pressure. And the problem remains
as to the balance of forces. In essence, these instruments indicate,
not measure.

As for the local air, there is none in
many radiometers that are more sensitive than the Crookes.

Again, which radiometer? If you are arguing a "perfect" vacuum, then
like a free lunch, I would agree there's no such thing. The Crookes
radiometer requires a partial atmosphere to work, other radiometers
work quite fine with much less.

Depends entirely on what one intends to measure.

The coy context of the thread was measuring the mass of a Photon.
Absolutely no SI Units have been named or any quantitative values
offered (the rather standard omission from claims made here). However,
feel free to introduce your own side thread's goal or even offer a
guess (your own quatitative value for the mass). Such additional
discussion would vastly elevate the inane repetition of claims above
the level of "Photons have the flavor of Crème brûlée."

73's
Richard Clark, KB7QHC