If you download and look at Part 1 from
http://www.lancs.ac.uk/users/spc/teaching/py225/phys225.htm

You'll see this on page 6:

LATER WORK ON THE AETHER WIND.
1904 Morley & Miller improved gear; showed wind below 12% of orbit speed.
1905 They used same interferometer up a hill, 870 ft above sea level;
got a "very definite positive effect", but much smaller than theory.
1921 Miller used a new interferometer on Mount Wilson, 5700 ft up;
found wind was ~25% of orbit speed.
1924-6 Miller revisited Mount Wilson and declared solar system has
a 200 km/s speed in the aether. Got $1000 prize from AAAS.
1929 Michelson, Pease & Pearson found wind is below 10% of orbit speed.
1930 Joos at Zeiss laboratory showed wind is less than 5% of orbit speed.
1954 Shankland re-analysed all Miller results as consistent with a net null result.
Probably temperature changes caused "aether" effects previously claimed.

You can see that the MM experiment isn't a complete null.

There is no way of measuring a perfect zero in physics, idiot.

Ted, you are the stupidest Einsteinian extremist on this forum. Partial results were measured in these experiments. You demonstrate the stupidity of Einstein supporters. I hope one of the freedom fighters beats you up soon.

What the partial results show is that the Lorentz contraction and time dilation equations for SR are inaccurate, ie. they don't agree with experimental results. Also when SR is taught, the length contraction is often refered to as the Lorentz contraction, which isn't right. The Lorentz aether theory is different from Einstein's SRT.

Bill Garbage: What the partial results show is that the Lorentz contraction and time dilation equations for SR are inaccurate, ie. they don't agree with experimental results. Also when SR is taught, the length contraction is often refered to as the Lorentz contraction, which isn't right. The Lorentz aether theory is different from Einstein's SRT.

Ted: The two theoris make exactly the same predictions. They cannot be distinguished experimentally. No experiment has falsified either, dumbotron

Bill, we've moved on a bit since 1904. You need to catch up on oure reading.

In recent times versions of the MichelsonMorley experiment have become commonplace. Lasers and masers amplify light by repeatedly bouncing it back and forth inside a carefully tuned cavity, thereby inducing high-energy atoms in the cavity to give off more light. The result is an effective path length of kilometers. Better yet, the light emitted in one cavity can be used to start the same cascade in another set at right angles, thereby creating an interferometer of extreme accuracy.

The first such experiment was led by Charles H. Townes, one of the co-creators of the first maser. Their 1958 experiment put an upper limit on drift, including any possible experimental errors, of only 30 m/s. In 1974 a repeat with accurate lasers in the triangular Trimmer experiment reduced this to 0.025 m/s, and included tests of entrainment by placing one leg in glass. In 1979 the Brillet-Hall experiment put an upper limit of 30 m/s for any one direction, but reduced this to only 0.000001 m/s for a two-direction case (i.e., still or partially entrained aether). A year long repeat known as Hils and Hall, published in 1990, reduced the limit of anisotropy to 2×10-13.

http://en.wikipedia.org/wiki/Michelson-Morley_experiment