[ARC5] Michelson-Morley beats 24 GHz work by about 50 years
J. Forster
jfor at quikus.com
Sat Nov 16 14:19:08 EST 2013
MM is one of THE landmark experiments in modern physics. It killed 'Ether
Drift'.
-John
=================
> Hello Tom,
> It's fascinating to read reports from these early experiments.
> Michelson - Morely is a comparable study. This is an easy report to
> find (and read).
>
> Plus - no-one will say this - I believe it was the work of MM that
> led Einstein to propose his special theory in 1905.
> I believe that science "physicists" tried to find the error in MM's
> work for 20 years.
> I believe that Einstein's genius was to accept MM. But that's only a
> guess on my part.
> How's that for influential?
>
> I've read the original publication by Michelson-Morely and the
> extra-ordinary effort they put into the design of their gear - eg
> floating the light-source etc on a slab of marble in a pool of Hg in
> the basement (where there is less vibration). I'll bet the OH&S people
> would warn them "off campus" today - with all that mercury floating
> around.
>
>
>
> 73 de Les Smith
> [1]vk2bcu at operamail.com
>
>
> On Sat, Nov 16, 2013, at 10:44, Tom Dawson wrote:
>
> Here's the reference
>
> Phys. Rev. 45, 234–237 (1934)
>
>
> I've not seen anything available for free download, I printed out a
> microfilm copy in about '81 from a university library, but couldn't put
> my hands on the paper unless I was looking for something else.
>
> Certainly an outstanding effort on the part of the authors.
>
>
> regards,
>
> Tom
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "Leslie Smith" <[2]vk2bcu at operamail.com>
> To: "ARC-5 List" <[3]arc5 at mailman.qth.net>
> Sent: Friday, November 15, 2013 5:03 PM
> Subject: Re: [ARC5] 77 GHZ
>
>
>
> > Hello Tom,
> > This is pretty interesting, I'd like to know more.
> > Where can I read about this?
> >
> > Recently I've been repairing older Varian NRM spectrometers, and
> the
> > precision of the signals (wrt frequency) is astonishing.
> > Flipping a proton (in a molecule) results in a frequency shift of
> > several Hz - measured at 90.000 MHz.
> > Fascinating - and this is measured using 1970's technology. No
> uP,
> > nothing digital, even the chart-recorder used the older motor and
> > error pot to position the pen.
> > All that - and it still works nicely.
> >
> > 73 de Les Smith
> > [4]vk2bcu at operamail.com
> >
> >
> > On Sat, Nov 16, 2013, at 6:50, Tom Dawson wrote:
> >> I think the prize goes to Cleeton and Williams at U Mich in the
> early
> >> '30's
> >> for discovering the absorption spectra of Ammonia at 24 (I
> think) GHz.
> >>
> >> Used Western Electric Magnetrons as models and scaled them down
> in size
> >> to
> >> the desired frequency to generate the RF.
> >>
> >> Polished brass parabolic mirrors on transmit and receive,
> selenium rod as
> >> a
> >> detector.
> >>
> >> Wavelength measured with metal diffration gratings.
> >>
> >> Ammonia at 1 ATM in a rubberized canvas bag, they observed
> absorption of
> >> the
> >> microwave energy.
> >>
> >> The idea came from their consideration that if quantumtheory was
> true,
> >> then
> >> there ought to be an absorption line at 24 GHz or so, and they
> found it.
> >> Opened up the field of microwave spectroscopy, as far as I know.
> >>
> >> Pretty durn neat for the time.
> >>
> >> 73
> >>
> >> Tom
> >> ----- Original Message -----
> >> From: "David Stinson" <[5]arc5 at ix.netcom.com>
> >> To: "ARC-5 List" <[6]arc5 at mailman.qth.net>
> >> Sent: Friday, November 15, 2013 1:40 PM
> >> Subject: Re: [ARC5] 77 GHZ
> >>
> >>
> >> > Similar surprise:
> >> > I have an Aircraft Radio Corporation 1945 catalog, flogging
> their surplus
> >> > parts from cancelled contracts at the end of WWII.
> >> > All kinds of Command Set parts being offered.
> >> >
> >> > But they were also offering feedlines, cavities
> >> > and other "plumbing" for 21 GHZ.
> >> > Who knew anyone was "plumbing" 21 GHZ in 1945?
> >> > ______________________________________________________________
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> References
>
> 1. mailto:vk2bcu at operamail.com
> 2. mailto:vk2bcu at operamail.com
> 3. mailto:arc5 at mailman.qth.net
> 4. mailto:vk2bcu at operamail.com
> 5. mailto:arc5 at ix.netcom.com
> 6. mailto:arc5 at mailman.qth.net
> 7. http://mailman.qth.net/mailman/listinfo/arc5
> 8. http://mailman.qth.net/mmfaq.htm
> 9. mailto:ARC5 at mailman.qth.net
> 10. http://www.qsl.net/
> 11. http://www.qsl.net/donate.html
> 12. http://mailman.qth.net/mailman/listinfo/arc5
> 13. http://mailman.qth.net/mmfaq.htm
> 14. mailto:ARC5 at mailman.qth.net
> 15. http://www.qsl.net/
> 16. http://www.qsl.net/donate.html
> 17. http://www.fastmail.fm/
> 18. http://mailman.qth.net/mailman/listinfo/arc5
> 19. http://mailman.qth.net/mmfaq.htm
> 20. mailto:ARC5 at mailman.qth.net
> 21. http://www.qsl.net/
> 22. http://www.qsl.net/donate.html
>
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