- foundation -
Light waves are coming from just above. Waves are horizontal, because these come from a far star. A triangular prism (set like pyramid) is moving to the right (or to the left). Frequency of two lights that entered both (right and left) slopes of prism, and left prism may not be equal. It may be caused by difference of light speed to both slopes.

- outline of experiment -
By change of the direction of prism (on the earth's surface), it may be able to examine, whether above effect exists or not (by interference of lights. Star light must be direct to prism). By this experiment (and if above effect exist), motion of the earth against aether may be detectable easily.

http://www.geocities.co.jp/Technopolis/2561/eng.html

From just above, a ray of light (fine laser beam) is coming. The prism traverses this vertical beam. Number of waves that enter both slopes of the prism may not be equal.

Supplement : Please imagine an observer. With motion of pin-point of laser beam (that hits the slopes of prism), he moves. Both motions are the same.

This is good article:
http://www.geocities.co.jp/Technopolis/2561/eng.html
But it costs me 2.5 megabytes to open it!

For some reason my Browser says to view it correctly you have to download and to install the Japanese Text Support.

I did; but when I opened it there was no Japanese text in it.

Thank you for your reply. URL of Japanese text is "lig"(English text is "eng").

Allow me to add a changed (partially) view about "Prism Experiment".

Value of secular aberration is unknown. Then, true position of stars on the celestial sphere is unknown also. Coming direction of star light (visible to come from just above) is uncertain. There is no way to find true direction. However, this situation is not fatal to this thought experiment. Because, about phenomenon of the difference of the number of waves that enter both faces of prism, coming direction of star light is unrelated obviously (when the prism is at standstill against diagonal star light ray, the number of waves that reach optional two points on the both faces of prism is equal). Then, this experiment may disclose the direction of the motion against aether. But how about the speed ? I want entrust it to capable men (but if it's able to measure the wave length of star light directly, the speed of motion against aether may be disclosed by other experiment).

In this thought experiment (with a prism), the speed of laser beam relative to both faces of prism is different !!

But the speed of a star light (even in outer space) seems not to be different (In a forum (in Japanese), someone pointed out. About details, see my web-site : The third ADDITIONAL, if you wish ).

Now. let's take a short rest. The following is that i wrote in a forum (about Michelson-Morley experiment).

If the air moves at the speed of 30km/sec relative to the instrument, expected result may be gotten. But the fact is that the air is at a stand-still. Zero result is only natural.

In a book "Theory of relativity" By W.Pauli 1958, it's written as follows. "Rather should one say that for an observer moving with the medium, light is propagated as usual with velocity c/n in all directions".

Supplement : In the vacuum, light may follow Ritz's emission theory. Ritz's theory is effective for a few second (may be). After this, light follows the aether (speed relative to the aether may be somewhat slower than c). The aether is one of media.

So, the result of M-M experiment in the vacuum is only natural too.