This is a clarification of Einstein's train gedanken

Two observers each have two identical clocks, which are rigidly held apart
by identical rods. The observers are located midway between their clocks in
both units, which are positioned parallel to each other. The four clocks
are equipped with flashing lights.

A_____________O1_____________B <--->v
C_____________O2_____________D

While the two units are adjacent, the four clocks are synchronized with
light signal from their midpoints.

In the experiment, the rods will move at 2v relative to each other but
before that, they are moved backwards and forwards at relative speed 2v to
check the synchronization in the moving condition.
Q1 are they found to be in synch?

During experiment(1) the two units are positioned as shown below before
both being identically set in motion at v towards each other.

A_____________O1_____________B ---->v
v<----C_____________O2_____________D

When the clocks are adjacent, all the clocks emit a light flash towards the
centre..

Q2) Do both observers receive the four flashes simultaneously?

Experiment(2) is similar except that now only the bottom unit will move...
but at 2v.

A_____________O1_____________B
2v<---C_____________O2_____________D

Q3) Do both observers now receive the four flashes simultaneously.

Q4) in both experiments, do the four clocks read the same when the flashes
are emitted

--
-- lover of truth

On Thursday, 11 May 2023 at 15:50:43 UTC+2, Jane wrote:
> This is a clarification of Einstein's train gedanken

And it's not any experiment, it's a nice
gedanken (fabricated) tale, just like
its predecessor.

Le 11/05/2023 à 15:48, Jane a écrit :
> This is a clarification of Einstein's train gedanken
>
> Two observers each have two identical clocks, which are rigidly held apart
> by identical rods. The observers are located midway between their clocks in
> both units, which are positioned parallel to each other. The four clocks
> are equipped with flashing lights.
>
> A_____________O1_____________B <--->v
> C_____________O2_____________D
>
> While the two units are adjacent, the four clocks are synchronized with
> light signal from their midpoints.
>
> In the experiment, the rods will move at 2v relative to each other but
> before that, they are moved backwards and forwards at relative speed 2v to
> check the synchronization in the moving condition.
> Q1 are they found to be in synch?
>
> During experiment(1) the two units are positioned as shown below before
> both being identically set in motion at v towards each other.
>
> A_____________O1_____________B ---->v
> v<----C_____________O2_____________D
>
> When the clocks are adjacent, all the clocks emit a light flash towards the
> centre..
>
> Q2) Do both observers receive the four flashes simultaneously?
>
> Experiment(2) is similar except that now only the bottom unit will move...
> but at 2v.
>
> A_____________O1_____________B
> 2v<---C_____________O2_____________D
>
> Q3) Do both observers now receive the four flashes simultaneously.
>
> Q4) in both experiments, do the four clocks read the same when the flashes
> are emitted
>

Je sais pas si c'est mon traducteur, mais je ne comprends rien du tout.

R.H.

On Thu, 11 May 2023 22:57:12 +0000, Richard Hachel wrote:

> Le 11/05/2023 à 15:48, Jane a écrit :
>> This is a clarification of Einstein's train gedanken
>>
>> Two observers each have two identical clocks, which are rigidly held
>> apart by identical rods. The observers are located midway between their
>> clocks in both units, which are positioned parallel to each other. The
>> four clocks are equipped with flashing lights.
>>
>> A_____________O1_____________B <--->v
C_____________O2_____________D
>>
>> While the two units are adjacent, the four clocks are synchronized with
>> light signal from their midpoints.
>>
>> In the experiment, the rods will move at 2v relative to each other but
>> before that, they are moved backwards and forwards at relative speed 2v
>> to check the synchronization in the moving condition.
>> Q1 are they found to be in synch?
>>
>> During experiment(1) the two units are positioned as shown below before
>> both being identically set in motion at v towards each other.
>>
>> A_____________O1_____________B ---->v
>> v<----C_____________O2_____________D
>>
>> When the clocks are adjacent, all the clocks emit a light flash towards
>> the centre..
>>
>> Q2) Do both observers receive the four flashes simultaneously?
>>
>> Experiment(2) is similar except that now only the bottom unit will
>> move... but at 2v.
>>
>> A_____________O1_____________B
>> 2v<---C_____________O2_____________D
>>
>> Q3) Do both observers now receive the four flashes simultaneously.
>>
>> Q4) in both experiments, do the four clocks read the same when the
>> flashes are emitted
>>
>>
> Je sais pas si c'est mon traducteur, mais je ne comprends rien du tout.
>
> R.H.

The experimental detail should be obvious whatever language is used.
One pair of clocks is moved past another identical pair.....Each one
flashes a light when they are all adjacent.
It is very simple...

--
-- lover of truth

On Thu, 11 May 2023 12:37:56 -0700, Maciej Wozniak wrote:

> On Thursday, 11 May 2023 at 15:50:43 UTC+2, Jane wrote:
>> This is a clarification of Einstein's train gedanken
>
> And it's not any experiment, it's a nice gedanken (fabricated) tale,
> just like its predecessor.

but this one will destroy Einstein with logic....work it out....

--
-- lover of truth

Le 12/05/2023 à 01:12, Jane a écrit :
> On Thu, 11 May 2023 22:57:12 +0000, Richard Hachel wrote:
>
>> Le 11/05/2023 à 15:48, Jane a écrit :
>>> This is a clarification of Einstein's train gedanken
>>>
>>> Two observers each have two identical clocks, which are rigidly held
>>> apart by identical rods. The observers are located midway between their
>>> clocks in both units, which are positioned parallel to each other. The
>>> four clocks are equipped with flashing lights.
>>>
>>> A_____________O1_____________B <--->v
> C_____________O2_____________D
>>>
>>> While the two units are adjacent, the four clocks are synchronized with
>>> light signal from their midpoints.
>>>
>>> In the experiment, the rods will move at 2v relative to each other but
>>> before that, they are moved backwards and forwards at relative speed 2v
>>> to check the synchronization in the moving condition.
>>> Q1 are they found to be in synch?
>>>
>>> During experiment(1) the two units are positioned as shown below before
>>> both being identically set in motion at v towards each other.
>>>
>>> A_____________O1_____________B ---->v
>>> v<----C_____________O2_____________D
>>>
>>> When the clocks are adjacent, all the clocks emit a light flash towards
>>> the centre..
>>>
>>> Q2) Do both observers receive the four flashes simultaneously?
>>>
>>> Experiment(2) is similar except that now only the bottom unit will
>>> move... but at 2v.
>>>
>>> A_____________O1_____________B
>>> 2v<---C_____________O2_____________D
>>>
>>> Q3) Do both observers now receive the four flashes simultaneously.
>>>
>>> Q4) in both experiments, do the four clocks read the same when the
>>> flashes are emitted
>>>
>>>
>> Je sais pas si c'est mon traducteur, mais je ne comprends rien du tout.
>>
>> R.H.
>
> The experimental detail should be obvious whatever language is used.
> One pair of clocks is moved past another identical pair.....Each one
> flashes a light when they are all adjacent.
> It is very simple...

How do you synchronize your watches?

Two watches can only be synchronized for the central watch.

That is to say that for O, A and B will mark the same time at the same
instant.

But already, that poses a problem, because, A and B will perhaps mark the
same hour at the same instant, for O, but O will not mark the same hour as
the two others.

This is the first problem.

Another problem will arise, it is that the rod A'B' which will cross AB
will be shorter than AB, and that the crossings cannot be simultaneous.

Moreover, the chronotropy (which is the internal measurement of time in a
frame of reference) will be different in the AB system and in the A'B'
system.

In the system AB the clocks of A'B' will have a lower bathmotropy (they
will be less excited) and the same for A'B' which will consider that it is
the clocks of AB which beat less quickly.

It's very complicated, your thing.

R.H.

On 11-May-23 11:48 pm, Jane wrote:
> This is a clarification of Einstein's train gedanken
>
> Two observers each have two identical clocks, which are rigidly held apart
> by identical rods. The observers are located midway between their clocks in
> both units, which are positioned parallel to each other. The four clocks
> are equipped with flashing lights.
>
> A_____________O1_____________B <--->v
> C_____________O2_____________D
>
> While the two units are adjacent, the four clocks are synchronized with
> light signal from their midpoints.

Clock synchronisation takes time - the time for the light to propagate
to the clocks from the mid point.

So what does "while the two units are adjacent" mean in this context?

Sylvia.

On Thursday, May 11, 2023 at 6:50:43 PM UTC+5, Jane wrote:
> This is a clarification of Einstein's train gedanken
>
> Two observers each have two identical clocks, which are rigidly held apart
> by identical rods. The observers are located midway between their clocks in
> both units, which are positioned parallel to each other. The four clocks
> are equipped with flashing lights.
>
> A_____________O1_____________B <--->v
> C_____________O2_____________D
>
> While the two units are adjacent, the four clocks are synchronized with
> light signal from their midpoints.
>
> In the experiment, the rods will move at 2v relative to each other but
> before that, they are moved backwards and forwards at relative speed 2v to
> check the synchronization in the moving condition.
> Q1 are they found to be in synch?
>
> During experiment(1) the two units are positioned as shown below before
> both being identically set in motion at v towards each other.
>
> A_____________O1_____________B ---->v
> v<----C_____________O2_____________D
>
> When the clocks are adjacent, all the clocks emit a light flash towards the
> centre..
>
> Q2) Do both observers receive the four flashes simultaneously?
>
> Experiment(2) is similar except that now only the bottom unit will move....
> but at 2v.
>
> A_____________O1_____________B
> 2v<---C_____________O2_____________D
>
> Q3) Do both observers now receive the four flashes simultaneously.
>
> Q4) in both experiments, do the four clocks read the same when the flashes
> are emitted
>
>
>
>
>
>
>
>
> --
> -- lover of truth

I have tried this before. Maybe we need a 3d graphic.

You do not need four clocks, just flash the light from the tracks to two adjacent mirrors on the train, just as the ends pass the stationary light sources on the tracks.

I have been trying to tell everyone that if an observer sees a light, it should be considered to be from a source stationary to the observer. Einstein himself said 'irrespective of the movement of the source'

This simple sentence cannot be parsed and understood.

On 5/11/2023 8:33 PM, Richard Hachel wrote:

> Moreover, the chronotropy (which is the internal measurement of time in
> a frame of reference)

Oh, you finally define some of your made-up nonsense words!
Unfortunately (for you, anyway), it appears that physics already has a
term for that. Proper time. No need for any made-up word.
>
> In the system AB the clocks of A'B' will have a lower bathmotropy (they
> will be less excited)

Another definition! Good for you. However, wtf does "excited" mean? How
does a clock get excited? It sees a pretty watch of the opposite sex?

> and the same for A'B' which will consider that it
> is the clocks of AB which beat less quickly.

According to the first postulate, all clocks tick at one second per second.

On Friday, 12 May 2023 at 01:16:25 UTC+2, Jane wrote:
> On Thu, 11 May 2023 12:37:56 -0700, Maciej Wozniak wrote:
>
> > On Thursday, 11 May 2023 at 15:50:43 UTC+2, Jane wrote:
> >> This is a clarification of Einstein's train gedanken
> >
> > And it's not any experiment, it's a nice gedanken (fabricated) tale,
> > just like its predecessor.
> but this one will destroy Einstein with logic....work it out....

Logic doesn't work against blind faith. Some
time ago I was also overestimating it, but
I have learnt.

On Friday, 12 May 2023 at 07:06:47 UTC+2, Volney wrote:
> On 5/11/2023 8:33 PM, Richard Hachel wrote:
>
> > Moreover, the chronotropy (which is the internal measurement of time in
> > a frame of reference)
> Oh, you finally define some of your made-up nonsense words!
> Unfortunately (for you, anyway), it appears that physics already has a
> term for that. Proper time. No need for any made-up word.
> >
> > In the system AB the clocks of A'B' will have a lower bathmotropy (they
> > will be less excited)
> Another definition! Good for you. However, wtf does "excited" mean? How
> does a clock get excited? It sees a pretty watch of the opposite sex?
> > and the same for A'B' which will consider that it
> > is the clocks of AB which beat less quickly.
> According to the first postulate, all clocks tick at one second per second.

Nope, even your idiot guru wasn't stupid enough to
claim something like that. Anyway, there are
billions of counterexamples. Actually, there is
nothing but counterexamples in the real world.

It only happens in your gedanken delusions.

Le 12/05/2023 à 07:06, Volney a écrit :
> On 5/11/2023 8:33 PM, Richard Hachel wrote:

> all clocks tick at one second per second.
Oui, ben on va pas ramer bien loin.

R.H.

Le 12/05/2023 à 07:06, Volney a écrit :
> On 5/11/2023 8:33 PM, Richard Hachel wrote:
>
>> Moreover, the chronotropy (which is the internal measurement of time in
>> a frame of reference)

> Oh, you finally define some of your made-up nonsense words!
> Unfortunately (for you, anyway), it appears that physics already has a
> term for that. Proper time. No need for any made-up word.

I'll tell you one thing, I hate made-up words, abstract words, useless
words, and meaningless words.

It makes me want, when I see that, to take a construction worker's shovel,
and push it through the face of the idiot who had to impose with this
behavior.

So you need to be reassured.

You must therefore leave this fear that paralyzes you.

Now when I use the word "bathmotropy
negative" or the word "relative chronotropy", I assure you that I do so
with a marvelous concern for understanding things.

These are terms that, for me, are unavoidable.

If you don't like it, don't piss others off.

R.H.

Maciej Wozniak wrote:

> On Friday, 12 May 2023 at 01:16:25 UTC+2, Jane wrote:
>> but this one will destroy Einstein with logic....work it out....
> Logic doesn't work against blind faith. Some time ago I was also
> overestimating it, but I have learnt.

South Africa responds to US claims of weapons deliveries to Russia
Washington’s accusations are disappointing and undermine
*_bilateral_ties_*, President Cyril Ramaphosa has said
https://%72%74.com/africa/576156-south-africa-russia-weapons/

what *_bilateral_*?? There is no *_bilateral_* with capitalist corrupt
america. This is a lie.

On Thu, 11 May 2023 19:03:38 -0700 (PDT), gehan.am...@gmail.com wrote:

> On Thursday, May 11, 2023 at 6:50:43 PM UTC+5, Jane wrote:
>> This is a clarification of Einstein's train gedanken
>>
>> Two observers each have two identical clocks, which are rigidly held
>> apart by identical rods. The observers are located midway between their
>> clocks in both units, which are positioned parallel to each other. The
>> four clocks are equipped with flashing lights.
>>
>> A_____________O1_____________B <--->v C_____________O2_____________D
>>
>> While the two units are adjacent, the four clocks are synchronized with
>> light signal from their midpoints.
>>
>> In the experiment, the rods will move at 2v relative to each other but
>> before that, they are moved backwards and forwards at relative speed 2v
>> to check the synchronization in the moving condition.
>> Q1 are they found to be in synch?
>>
>> During experiment(1) the two units are positioned as shown below before
>> both being identically set in motion at v towards each other.
>>
>> A_____________O1_____________B ---->v
>> v<----C_____________O2_____________D
>>
>> When the clocks are adjacent, all the clocks emit a light flash towards
>> the centre..
>>
>> Q2) Do both observers receive the four flashes simultaneously?
>>
>> Experiment(2) is similar except that now only the bottom unit will
>> move... but at 2v.
>>
>> A_____________O1_____________B 2v<---C_____________O2_____________D
>>
>> Q3) Do both observers now receive the four flashes simultaneously.
>>
>> Q4) in both experiments, do the four clocks read the same when the
>> flashes are emitted
>>
>>
>>
>>
>>
>>
>>
>>
>> --
>> -- lover of truth
>
> I have tried this before. Maybe we need a 3d graphic.
>
> You do not need four clocks, just flash the light from the tracks to two
> adjacent mirrors on the train, just as the ends pass the stationary
> light sources on the tracks.

You are right and I was just about to simplify the experiment without
clocks, although they might be imporatant later. All we need are two
observers and two light sources.

S1_____________O1 ---->v
v<----S2_____________O2

The two units are identical. They are initially separated as above then
accelerated identically towards each other.

S1_____________O1---->v
v<----S2_____________O2

At the instant the sources S1 and S3 are adjacent, O1 and O2 must also be
adjacent by symmetry. Both sources flash F1 and F2 when adjacent.

Now, according to Einstein, the flashes move at the same speed (absolutely
together). Therefore:

A) F1 and F2 must both reach O1 simultaneously and O2 simultaneously.

However, in the frame of S1, when F1 reaches O1, O1 will not be adjacent to
O2. Similarly, in the frame of S2, when F2 reaches O2, O2 will not be
adjacent to O1 and therefore:

B) the flashes cannot arrive simultaneously at either observer.

Note, simultaneity can be established absolutely at any single location.
Therefore two events that occur simultaneously at one location must be
simultaneous at ALL locations. It is therefore true that F1 and F2 are
emitted absolutely simultaneously. It is also true that they CANNOT arrive
at either observer absolutely simultaneously.

Relativists will now say, that is the whole point. O1 will believe the
flashes do not arrive simultaneously and so will O2 (but in reverse
order)...Trouble is, Einstein's P2 already said they must arrive absolutely
simultaneously at both observers.

P2 creates a logical impossibility.

--
-- lover of truth

On Fri, 12 May 2023 13:08:07 +0000, Jane wrote:

> On Thu, 11 May 2023 19:03:38 -0700 (PDT), gehan.am...@gmail.com wrote:
>
>> On Thursday, May 11, 2023 at 6:50:43 PM UTC+5, Jane wrote:
>>> This is a clarification of Einstein's train gedanken
>>>
>>> Two observers each have two identical clocks, which are rigidly held
>>> apart by identical rods. The observers are located midway between
>>> their clocks in both units, which are positioned parallel to each
>>> other. The four clocks are equipped with flashing lights.
>>>
>>> A_____________O1_____________B <--->v C_____________O2_____________D
>>>
>>> While the two units are adjacent, the four clocks are synchronized
>>> with light signal from their midpoints.
>>>
>>> In the experiment, the rods will move at 2v relative to each other but
>>> before that, they are moved backwards and forwards at relative speed
>>> 2v to check the synchronization in the moving condition.
>>> Q1 are they found to be in synch?
>>>
>>> During experiment(1) the two units are positioned as shown below
>>> before both being identically set in motion at v towards each other.
>>>
>>> A_____________O1_____________B ---->v
>>> v<----C_____________O2_____________D
>>>
>>> When the clocks are adjacent, all the clocks emit a light flash
>>> towards the centre..
>>>
>>> Q2) Do both observers receive the four flashes simultaneously?
>>>
>>> Experiment(2) is similar except that now only the bottom unit will
>>> move... but at 2v.
>>>
>>> A_____________O1_____________B
2v<---C_____________O2_____________D
>>>
>>> Q3) Do both observers now receive the four flashes simultaneously.
>>>
>>> Q4) in both experiments, do the four clocks read the same when the
>>> flashes are emitted
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
>>> -- lover of truth
>>
>> I have tried this before. Maybe we need a 3d graphic.
>>
>> You do not need four clocks, just flash the light from the tracks to
>> two adjacent mirrors on the train, just as the ends pass the stationary
>> light sources on the tracks.
>
> You are right and I was just about to simplify the experiment without
> clocks, although they might be imporatant later. All we need are two
> observers and two light sources.
>
> S1_____________O1 ---->v
> v<----S2_____________O2
>
> The two units are identical. They are initially separated as above then
> accelerated identically towards each other.
>
> S1_____________O1---->v
> v<----S2_____________O2
>
> At the instant the sources S1 and S3 are adjacent, O1 and O2 must also
> be adjacent by symmetry. Both sources flash F1 and F2 when adjacent.
>
> Now, according to Einstein, the flashes move at the same speed
> (absolutely together). Therefore:
>
> A) F1 and F2 must both reach O1 simultaneously and O2 simultaneously.
>
> However, in the frame of S1, when F1 reaches O1, O1 will not be adjacent
> to O2. Similarly, in the frame of S2, when F2 reaches O2, O2 will not be
> adjacent to O1 and therefore:
>
> B) the flashes cannot arrive simultaneously at either observer.
>
> Note, simultaneity can be established absolutely at any single location.
> Therefore two events that occur simultaneously at one location must be
> simultaneous at ALL locations. It is therefore true that F1 and F2 are
> emitted absolutely simultaneously. It is also true that they CANNOT
> arrive at either observer absolutely simultaneously.
>
> Relativists will now say, that is the whole point. O1 will believe the
> flashes do not arrive simultaneously and so will O2 (but in reverse
> order)...Trouble is, Einstein's P2 already said they must arrive
> absolutely simultaneously at both observers.
>
> P2 creates a logical impossibility.

This is obviously wrong because in ether theory, the flashes effectively
become one flash...the same applies in SR by postulate.
You wont get anywhere with this kind of argument. Thought experiments like
this would have been thrashed out many times 120 years ago when just about
every Physicist in the world was tryng to explain the MMX null result.
The fact is, LET would work if an ether existed...and so would SR because
Einstein simply postulated the Ether's light speed unification ability.

But there is no Ether....so?

--
-- lover of truth

On Friday, May 12, 2023 at 6:08:10 PM UTC+5, Jane wrote:
> On Thu, 11 May 2023 19:03:38 -0700 (PDT), gehan.am...@gmail.com wrote:
>
> > On Thursday, May 11, 2023 at 6:50:43 PM UTC+5, Jane wrote:
> >> This is a clarification of Einstein's train gedanken
> >>
> >> Two observers each have two identical clocks, which are rigidly held
> >> apart by identical rods. The observers are located midway between their
> >> clocks in both units, which are positioned parallel to each other. The
> >> four clocks are equipped with flashing lights.
> >>
> >> A_____________O1_____________B <--->v C_____________O2_____________D
> >>
> >> While the two units are adjacent, the four clocks are synchronized with
> >> light signal from their midpoints.
> >>
> >> In the experiment, the rods will move at 2v relative to each other but
> >> before that, they are moved backwards and forwards at relative speed 2v
> >> to check the synchronization in the moving condition.
> >> Q1 are they found to be in synch?
> >>
> >> During experiment(1) the two units are positioned as shown below before
> >> both being identically set in motion at v towards each other.
> >>
> >> A_____________O1_____________B ---->v
> >> v<----C_____________O2_____________D
> >>
> >> When the clocks are adjacent, all the clocks emit a light flash towards
> >> the centre..
> >>
> >> Q2) Do both observers receive the four flashes simultaneously?
> >>
> >> Experiment(2) is similar except that now only the bottom unit will
> >> move... but at 2v.
> >>
> >> A_____________O1_____________B 2v<---C_____________O2_____________D
> >>
> >> Q3) Do both observers now receive the four flashes simultaneously.
> >>
> >> Q4) in both experiments, do the four clocks read the same when the
> >> flashes are emitted
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> --
> >> -- lover of truth
> >
> > I have tried this before. Maybe we need a 3d graphic.
> >
> > You do not need four clocks, just flash the light from the tracks to two
> > adjacent mirrors on the train, just as the ends pass the stationary
> > light sources on the tracks.
> You are right and I was just about to simplify the experiment without
> clocks, although they might be imporatant later. All we need are two
> observers and two light sources.
>
> S1_____________O1 ---->v
> v<----S2_____________O2
>
> The two units are identical. They are initially separated as above then
> accelerated identically towards each other.
>
> S1_____________O1---->v
> v<----S2_____________O2
>
> At the instant the sources S1 and S3 are adjacent, O1 and O2 must also be
> adjacent by symmetry. Both sources flash F1 and F2 when adjacent.
>
> Now, according to Einstein, the flashes move at the same speed (absolutely
> together). Therefore:
>
> A) F1 and F2 must both reach O1 simultaneously and O2 simultaneously.
>

You must specify which frame of reference you are using. In each of the observers frame of reference they
will observe the light at a time t in their own frame.

The question is, what time will it take for them to observe each other's light flashes and are these different
times?

F1 and F3 are equidistant from 01 and 02 but the velocity of the source is 'immaterial'.

Figure this one out.

On Fri, 12 May 2023 19:18:59 -0700 (PDT), gehan.am...@gmail.com wrote:

> On Friday, May 12, 2023 at 6:08:10 PM UTC+5, Jane wrote:
>> On Thu, 11 May 2023 19:03:38 -0700 (PDT), gehan.am...@gmail.com wrote:
>>
>> > On Thursday, May 11, 2023 at 6:50:43 PM UTC+5, Jane wrote:
>> >> This is a clarification of Einstein's train gedanken
>> >>
>> >> Two observers each have two identical clocks, which are rigidly held
>> >> apart by identical rods. The observers are located midway between
>> >> their clocks in both units, which are positioned parallel to each
>> >> other. The four clocks are equipped with flashing lights.
>> >>
>> >> A_____________O1_____________B <--->v C_____________O2_____________D
>> >>

>> >
>> > I have tried this before. Maybe we need a 3d graphic.
>> >
>> > You do not need four clocks, just flash the light from the tracks to
>> > two adjacent mirrors on the train, just as the ends pass the
>> > stationary light sources on the tracks.
>> You are right and I was just about to simplify the experiment without
>> clocks, although they might be imporatant later. All we need are two
>> observers and two light sources.
>>
>> S1_____________O1 ---->v v<----S2_____________O2
>>
>> The two units are identical. They are initially separated as above then
>> accelerated identically towards each other.
>>
>> S1_____________O1---->v v<----S2_____________O2
>>
>> At the instant the sources S1 and S3 are adjacent, O1 and O2 must also
>> be adjacent by symmetry. Both sources flash F1 and F2 when adjacent.
>>
>> Now, according to Einstein, the flashes move at the same speed
>> (absolutely together). Therefore:
>>
>> A) F1 and F2 must both reach O1 simultaneously and O2 simultaneously.
>>
>>
> You must specify which frame of reference you are using. In each of the
> observers frame of reference they will observe the light at a time t in
> their own frame.

It does not matter if P2 is assumed correct. The two flashes become
one....which is of course ridiculous. (Does F1 change speed to join F2 or
F2 change speed to join F1). Relativists would say neither is the case. The
light from both always moves at c in every frame....again ridiculous...but
if an ether exists as well as the LTs, it can be true.

> The question is, what time will it take for them to observe each
> other's light flashes and are these different times?

Now, Einsteinains are cunning.
They will claim that the times for the flashes to reach the observers is
the same because it moves at c in all frames and when the flashes jointly
occur, both observers are the same distance away. That seems like nonsense
to any normal person and of course is. It is obvious that O2 will receive
F1 before F2 does...but SR says his clock runs fast and so the observers
record the same times for both.
They might also argue that when the sources are adjacent and the flashes
are simultaneously emitted, the observers are not adjacent. But they will
base that claim on the prior assumption that the RoS is correct. In other
words, they will employ circular logic to justify their claim...and it will
appear to work..

> F1 and F2 are equidistant from 01 and 02 but the velocity of the source
> is 'immaterial'.

Yes . but in real life it is not immaterial.

> Figure this one out.

--
-- lover of truth