In sci.physics.relativity, Len Gaasenbeek

wrote
on Fri, 4 Nov 2005 08:19:49 -0500
:
What does TWLS stand for?

Two Way Light Speed.


wrote in message
oups.com...
SRians claim that there were a lot of direct TWLS measurements done
before they settle on the current defintion for TWLS of 1
light-second/1 clock second.

I asked them to give me references for such direct measurements but
they refused. Instead they sent me to a wild goose chase. They sent me
to sites that describes the method they use that give rise to the
current definition for a meter.

Is it possible that they never measure the TWLS of light
directly?????????????

Ken Seto





--
#191,
It's still legal to go .sigless.

wrote:
How is that a direct measurement of TWLS????

The frequency of the cavitiy is established by the time
required for light to propagate its length and reflect
back.


http://www.ee.surrey.ac.uk/Personal/...es/wguide.html

Sue...

That's not a direct measurement of TWLS. It assumes that there is a
corresponding wavelength for the detected frequency to give TWLS equal
to c.

wrote:
That's not a direct measurement of TWLS. It assumes that there is a
corresponding wavelength for the detected frequency to give TWLS equal
to c.

http://www.glenbrook.k12.il.us/gbssc...Kin/U1L1d.html

Sue...

wrote:
TWLS= Two-way light speed
It is supposed to be measured as follows:
1. the one clock and the reflecting mirror are at rest wrt each other.
2. the distance between the clock and the reflecting mirror is masured
with a ruler call this distance L.
3. The flight time for light to return from the mirror to the clock is
recorded by the clock.....call this time Tr.
4. TWLS=2L/Tr.

You forgot:
5. TWLS is corrected for any instrumentation effects there might be
in the clock, source, detector, ruler, and mirror.


Tom Roberts

This is nonsense. What you are saying is that if the answer doesn't
come out to be c you can make all these assumed corrections to make the
answer comes out to be c.

Ken Seto

How come all your posts are irrelevant??????

How come all your posts are irrelevant??????

wrote:
SRians claim that there were a lot of direct TWLS measurements done
before they settle on the current defintion for TWLS of 1
light-second/1 clock second.

I asked them to give me references for such direct measurements but
they refused. Instead they sent me to a wild goose chase. They sent me
to sites that describes the method they use that give rise to the
current definition for a meter.

Is it possible that they never measure the TWLS of light
directly?????????????

Ken Seto

Ken, read the articles. Note that many of those experiments were done
*years* before the decision to revise the standard of the meter. The
decision to revise the standard of the meter was not even entertained
until these experiments measuring TWLS had established that the
measured value was indeed constant, in agreement from experiment to
experiment, and with sufficient precision that it competed with the
precision of the standard meter bar in France.
You can NOT deduce from the titles of the experiments, nor the
abstracts, nor the dates of publication, how they did the experiment
and how they measured TWLS.

PD

So why don't you give us one reference where TWLS was measured the old
fashion way with the correction of the delay time at the mirror???

Ken Seto