"Hexenmeister" <vanquish@broom.Mickey> wrote in message 
news:LYtQf.148252$YJ4.77818@fe2.news.blueyonder.co.uk...
|
| [Hurry up and snip in case someone reads it]
|
| Hey, all you die-hard phuckwits out there, Bilge, Roberts, Goose, Duck,
| Van de merde, Tusselad, Ghost, you have a heretic among you.
|
|
| Bielawski is uttering unclean heresies about the holy word of Einstein.
|
| He notices what he THINKS is an "experimental assumption"
| and then he says "Try to prove condition 2 yourself".
|
| Dear oh dear, since when did he learn such disgusting words as
| "think" and "prove"?
| And to actively encourage others to do so as well, that is unholy
| in the sight of Almighty Einstein. Its blasphemous!
|
| You should immediately put him to the rack, force him to confess his
| sins and then burn him to a steak at a stake.
| You'll have to burn him to save his soul from eternal Newtonian Mechanics
| and universal time.
|
|
| Androcles.
|
|
| "JanPB" <filmart@gmail.com> wrote in message
| news:1141974652.622647.97600@j52g2000cwj.googlegroups.com...
| > kk's postings about physical content of Einstein's postulates made me
| > look again at his 1905 paper and I noticed what I think is another
| > experimental assumption.
| >
| > Recall Einstein's definition of synchronisation of two clocks A and B:
| > send a light pulse from A to B, reflect the light at B back to A,
| > register the emmission and the arrival times: t_A, t_B, and t'_A. The
| > clocks A and B are synchronised if:
| >
| >    t_B - t_A = t'_A - t_B    (*)
| > (Equivalently, one can send two light rays, from A to B and from B to A
| > and then the requirement is that:
| >
| >     t_B - t_A = t'_A - t'_B,    (**)
| >
| > where t'_B is the second ray's emission time at B.)
| >
| > He then says: "We assume that this definition of synchronism is free
| > from contradictions" and notes that the following two conditions are
| > satisfied (thus guaranteeing the "freedom from contradictions"):
| >
| >   "1. If the clock at B synchronizes with the clock at A, the clock at
| > A synchronizes with the clock at B.
| >   2. If the clock at A synchronizes with the clock at B and also with
| > the clock at C, the clocks at B and C also synchronize with each
| > other."
| >
| > This portion of the 1905 paper is frequently glossed over (I've never
| > seen it discussed on this NG) but the second condition is in fact
| > non-trivial and it demands that certain experiment yield certain
| > result. Otherwise Einstein's synchronisation of clocks is vacuous.
| > Try to prove condition 2 yourself: sync clock at A with clock at B
| > (condition (*) or (**) satisfied), and also clock at A with clock at C
| > (ditto), and based on this try to prove that B is in sync with C
| > (again, this means that (*) or (**) must hold for B and C). While doing
| > this remember that A, B, C are in 3D space, i.e., not necessarily
| > colinear.
| >
| > You'll see you cannot prove it unless you know that the following is
| > also true: the time it takes for a light ray to complete a triangular
| > roundtrip A-B-C-A equals the time it takes for a light ray to complete
| > the reverse triangular trip: A-C-B-A (imagine mirrors positioned at B
| > and C to make the light ray go around). This must be verified
| > experimentally, otherwise there is a chance the definition of Einstein
| > sync is vacuous.
| >
| > The experiment in question was performed by Fizeau (and maybe others?)
| > around 1860 so Einstein certainly knew about it. BTW, note that only
| > one clock (at A) is used since a triangular *roundtrip* is what's being
| > timed, so no simultaneity issues arose here. (AFAIK Fizeau verified
| > this not just for triangles but for more general polygonal paths.)
| >
| > As a footnote/corollary: it can be shown by an easy calculation that
| > ether wind (light-dragging by ether) makes the two triangular (or
| > polygonal) roundtrip times in Fizeau's experiment *unequal* (the
| > difference is of second order in v/c, where v=ether wind speed). So the
| > existence of consistently Einstein-synchronised clocks in all inertial
| > systems rules out ether wind under the SR regime using synchronised
| > clocks.
| >
| > --
| > Jan Bielawski
|


Nobody wants to respond after 16 hours?
Well, well...
Looks like Bilewacky gets to be known as Jan, the born-again scientist.

You won't need Fizeau, my son. The three clocks A, B and C are located
on Mars with "Spirit" and "Opportunity", near Saturn with "Cassini" and
of course on good ol' Earth.
All three are synchronized and the time each reads back to Earth is 
different.

Confess your sins and be given absolution, my son. For penance
read the words of the Father of Science:
   http://webexhibits.org/calendars/year-text-Galileo.html
Then say three times on each day for a week:
 "HAIL HANNAH FULL OF GRACE, GALILEO IS WITH THEE. BLESSED ART THOU AMONG 
WOMEN AND BLESSED IS THE FRUIT OF THY WOMB, ISAAC. HOLY HANNAH, MOTHER OF 
SCIENCE, EXPERIMENT WITH US SINNERS, NOW AND AT THE HOUR OF OUR DISCOVERIES. 
AMEN."

Come now and be baptised in the Name of Galileo the Father, Newton
the Son and Science the Holy Ghost.
Father Androcles.