Re: Testing the oneway lightspeed constancy

On Mar 21, 6:47 pm, Darwin123 <drosen0...@xxxxxxxxx> wrote:
On Mar 21, 2:57 pm, "Androcles" <Headmas...@xxxxxxxxxxxxxxxx> wrote:

"xray4abc" <lemhen...@xxxxxxxx> wrote in message
You can do that too, but the "experiment" that really combines MMX
and a moving source of light is Sagnac. It's no longer an experiment,
though, the ring laser gyroscope is in common use.

Yes, it is in common use. The reason is that the Sagnac
interferometer measures acceleration relative to the center of the
ring. The Sagnac interferometer has never measured velocity. No one
ever said it measured absolute velocity or relative velocity.
I have to correct myself just a little. Yes, some scientists
sometimes claim that the speed of the earth is measured by the Sagnac
interferometer. Similarly, they say that the Foucault pendulum
measures the velocity of the earth. The statements are oversimplified.
The correct way to say them is as follows. The Sagnac
interferometer and the Foucault pendulum prove that the earth is
moving by measuring the centripetal acceleration of the earth. The
velocity that is being measured is the difference between the
velocities on one side of the cavity and the other. There is a subtle
difference here.
The Sagnac interferometer is not in free fall. It is beings
supported by the ground upon which it rests. Therefore, the contact
forces of the ground are accelerating it. The corresponding velocity
is not defined in an entirely straightforward manner.

Once again, the physicist Charles Ives was a jerk. The composer
Charles Ives was pretty good.
.

Relevant Pages

  • Re: The Emission Theory of Androcles
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  • Re: Testing the oneway lightspeed constancy
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