[ARC5] Michelson-Morley beats 24 GHz work by about 50 years

Fri Nov 15 23:20:10 EST 2013

  Speaking of Michelson and Morley, we all know the real EITHER NET is radio.
Hi Hi Hi
73
Bill wa4lav

________________________________________
From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on behalf of Leslie Smith [vk2bcu at operamail.com]
Sent: Friday, November 15, 2013 8:15 PM
To: ARC-5 List
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

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9. mailto:ARC5 at mailman.qth.net
  10. http://www.qsl.net/
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  12. http://mailman.qth.net/mailman/listinfo/arc5
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  14. mailto:ARC5 at mailman.qth.net
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  17. http://www.fastmail.fm/
  18. http://mailman.qth.net/mailman/listinfo/arc5
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