[ARC5] Michelson-Morley beats 24 GHz work by about 50 years
Gene Smar
ersmar at verizon.net
Sat Nov 16 09:58:03 EST 2013
Les:
My college physics professor opined that MM did indeed influence
Einstein's thinking about light's velocity being a universal constant, hence
leading to his famous thought experiment that gave rise to his theory of
relativity. You're in good company, my friend.
73 de
Gene Smar AD3F
P.S. I, too, was thinking of the hazard associated with all that Hg at
their feet.
----- Original Message -----
From: "Leslie Smith" <vk2bcu at operamail.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Friday, November 15, 2013 8:15 PM
Subject: [ARC5] Michelson-Morley beats 24 GHz work by about 50 years
> 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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