Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
Hey, that's what the 'tute website said, I'm just reporting. The aforementioned dissertation features the same octagonal cell as described in the paper. For those of you with access to knowledge of ultracold quartz chambers, go right on ahead. On Mon, Nov 24, 2014 at 12:13 PM, Chuck Harris wrote: > The Linux program Okular has no trouble printing this file. > > -Chuck Harris > > > Robert LaJeunesse wrote: > >> I use an older XP based "drag and drop freeware PDF unlocker" that strips >> many PDF >> restrictions. It made the file below quite printable. >> >> Bob L. >> >> Sent: Monday, November 24, 2014 at 9:05 AM From: "Mark Kahrs" >>> To: "Discussion of precise time and frequency >>> measurement" Subject: Re: [time-nuts] MIT 2 inch >>> cesium >>> fountain, optically pumped >>> >>> For those who are interested, a relevant dissertation can be found here: >>> >>> http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf >>> >>> Unfortunately, you can't print it, but you can read it. A rather >>> complete >>> discussion of the construction of the experimental apparatus is included. >>> >> ___ time-nuts mailing list -- >> time-nuts@febo.com To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the >> instructions there. >> >> ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
The Linux program Okular has no trouble printing this file. -Chuck Harris Robert LaJeunesse wrote: I use an older XP based "drag and drop freeware PDF unlocker" that strips many PDF restrictions. It made the file below quite printable. Bob L. Sent: Monday, November 24, 2014 at 9:05 AM From: "Mark Kahrs" To: "Discussion of precise time and frequency measurement" Subject: Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped For those who are interested, a relevant dissertation can be found here: http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf Unfortunately, you can't print it, but you can read it. A rather complete discussion of the construction of the experimental apparatus is included. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
I use an older XP based "drag and drop freeware PDF unlocker" that strips many PDF restrictions. It made the file below quite printable. Bob L. > Sent: Monday, November 24, 2014 at 9:05 AM > From: "Mark Kahrs" > To: "Discussion of precise time and frequency measurement" > > Subject: Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped > > For those who are interested, a relevant dissertation can be found here: > > http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf > > Unfortunately, you can't print it, but you can read it. A rather complete > discussion of the construction of the experimental apparatus is included. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
On 11/24/14, 6:05 AM, Mark Kahrs wrote: For those who are interested, a relevant dissertation can be found here: http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf Unfortunately, you can't print it, but you can read it. A rather complete discussion of the construction of the experimental apparatus is included. That dissertation is about building a sensitive accelerometer, as opposed to a clock. There might be some connection: they're all about hanging some slow cold atoms out there to use as a sensor. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
That is a good paper. I can't understand much of it. There you go thats the measure. :-) Thanks Paul WB8TSL On Mon, Nov 24, 2014 at 9:05 AM, Mark Kahrs wrote: > For those who are interested, a relevant dissertation can be found here: > > http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf > > Unfortunately, you can't print it, but you can read it. A rather complete > discussion of the construction of the experimental apparatus is included. > > > On Thu, Nov 20, 2014 at 5:57 PM, Bob Camp wrote: > > > HI > > > > I saw that when it came out. It’s a CSAC based gizmo and thus a gas cell > > rather than a beam tube / state selection device. > > > > Bob > > > > > On Nov 20, 2014, at 8:37 AM, Peter Torry > > wrote: > > > > > > Hi Bob, > > > > > > Some time ago Hoptroff produced a Cs pocket watch using the > Symmetricom > > SA45s - now how long for a wrist watch !! > > > > > > http://www.engadget.com/2013/05/01/hoptroff-no-10/ > > > > > > Peter > > > (still pendulum controlled) > > > > > > > > > > > > On 20/11/2014 12:38, Bob Camp wrote: > > >> Hi > > >> > > >> So the wrist watch sized fountain that was promised 15 years ago isn’t > > gong to be here for Christmas this year? > > >> > > >> Bob > > >> > > >>> On Nov 20, 2014, at 12:17 AM, Magnus Danielson < > > mag...@rubidium.dyndns.org> wrote: > > >>> > > >>> Hi Rick, > > >>> > > >>> They did not mention the complexity of the laser system they needed, > > especially considering that the optical bench of a fountain isn't all > that > > small, and also because they want to de-tune lasers. While they seems to > > have an idea, they didn't touch on that subject. > > >>> > > >>> Nice to see that people think in a different way thought. > > >>> > > >>> Looking forward to see the progress on this one. > > >>> > > >>> Cheers, > > >>> Magnus > > >>> > > >>> On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: > > See: > > > > http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 > > > > Any comments? > > > > Rick Karlquist N6RK > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > >>> ___ > > >>> time-nuts mailing list -- time-nuts@febo.com > > >>> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > >>> and follow the instructions there. > > >> ___ > > >> time-nuts mailing list -- time-nuts@febo.com > > >> To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > >> and follow the instructions there. > > > > > > ___ > > > time-nuts mailing list -- time-nuts@febo.com > > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > and follow the instructions there. > > > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
For those who are interested, a relevant dissertation can be found here: http://dspace.mit.edu/bitstream/handle/1721.1/71453/795174737.pdf Unfortunately, you can't print it, but you can read it. A rather complete discussion of the construction of the experimental apparatus is included. On Thu, Nov 20, 2014 at 5:57 PM, Bob Camp wrote: > HI > > I saw that when it came out. It’s a CSAC based gizmo and thus a gas cell > rather than a beam tube / state selection device. > > Bob > > > On Nov 20, 2014, at 8:37 AM, Peter Torry > wrote: > > > > Hi Bob, > > > > Some time ago Hoptroff produced a Cs pocket watch using the Symmetricom > SA45s - now how long for a wrist watch !! > > > > http://www.engadget.com/2013/05/01/hoptroff-no-10/ > > > > Peter > > (still pendulum controlled) > > > > > > > > On 20/11/2014 12:38, Bob Camp wrote: > >> Hi > >> > >> So the wrist watch sized fountain that was promised 15 years ago isn’t > gong to be here for Christmas this year? > >> > >> Bob > >> > >>> On Nov 20, 2014, at 12:17 AM, Magnus Danielson < > mag...@rubidium.dyndns.org> wrote: > >>> > >>> Hi Rick, > >>> > >>> They did not mention the complexity of the laser system they needed, > especially considering that the optical bench of a fountain isn't all that > small, and also because they want to de-tune lasers. While they seems to > have an idea, they didn't touch on that subject. > >>> > >>> Nice to see that people think in a different way thought. > >>> > >>> Looking forward to see the progress on this one. > >>> > >>> Cheers, > >>> Magnus > >>> > >>> On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: > See: > > http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 > > Any comments? > > Rick Karlquist N6RK > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > >>> ___ > >>> time-nuts mailing list -- time-nuts@febo.com > >>> To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> ___ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > > > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
HI I saw that when it came out. It’s a CSAC based gizmo and thus a gas cell rather than a beam tube / state selection device. Bob > On Nov 20, 2014, at 8:37 AM, Peter Torry wrote: > > Hi Bob, > > Some time ago Hoptroff produced a Cs pocket watch using the Symmetricom > SA45s - now how long for a wrist watch !! > > http://www.engadget.com/2013/05/01/hoptroff-no-10/ > > Peter > (still pendulum controlled) > > > > On 20/11/2014 12:38, Bob Camp wrote: >> Hi >> >> So the wrist watch sized fountain that was promised 15 years ago isn’t gong >> to be here for Christmas this year? >> >> Bob >> >>> On Nov 20, 2014, at 12:17 AM, Magnus Danielson >>> wrote: >>> >>> Hi Rick, >>> >>> They did not mention the complexity of the laser system they needed, >>> especially considering that the optical bench of a fountain isn't all that >>> small, and also because they want to de-tune lasers. While they seems to >>> have an idea, they didn't touch on that subject. >>> >>> Nice to see that people think in a different way thought. >>> >>> Looking forward to see the progress on this one. >>> >>> Cheers, >>> Magnus >>> >>> On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: See: http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 Any comments? Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. >>> ___ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
Yes, but that one's just a GPS watch (with a humongous price tag). Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jason Rabel Sent: 20 November 2014 15:58 To: time-nuts@febo.com Subject: Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped Actually, I just looked at Hoptroff's website and guess what? Merry Christmas! http://www.hoptroff.com/collections/atomic-timepieces/products/no-16 > Some time ago Hoptroff produced a Cs pocket watch using the > Symmetricom SA45s - now how long for a wrist watch !! ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
This is simply great. I now know what to look for at the MIT flea next spring (If its around? Pure speculation on my part) No more GPS, CS, or RBs for me and to heck with LORAN C and WWVB also. Regards Paul WB8TSL On Thu, Nov 20, 2014 at 8:37 AM, Peter Torry wrote: > Hi Bob, > > Some time ago Hoptroff produced a Cs pocket watch using the Symmetricom > SA45s - now how long for a wrist watch !! > > http://www.engadget.com/2013/05/01/hoptroff-no-10/ > > Peter > (still pendulum controlled) > > > > > On 20/11/2014 12:38, Bob Camp wrote: > >> Hi >> >> So the wrist watch sized fountain that was promised 15 years ago isn’t >> gong to be here for Christmas this year? >> >> Bob >> >> On Nov 20, 2014, at 12:17 AM, Magnus Danielson < >>> mag...@rubidium.dyndns.org> wrote: >>> >>> Hi Rick, >>> >>> They did not mention the complexity of the laser system they needed, >>> especially considering that the optical bench of a fountain isn't all that >>> small, and also because they want to de-tune lasers. While they seems to >>> have an idea, they didn't touch on that subject. >>> >>> Nice to see that people think in a different way thought. >>> >>> Looking forward to see the progress on this one. >>> >>> Cheers, >>> Magnus >>> >>> On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: >>> See: http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 Any comments? Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. >>> ___ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >>> mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
Actually, I just looked at Hoptroff's website and guess what? Merry Christmas! http://www.hoptroff.com/collections/atomic-timepieces/products/no-16 > Some time ago Hoptroff produced a Cs pocket watch > using the Symmetricom SA45s - now how long for a wrist watch !! ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
Hi Bob, Some time ago Hoptroff produced a Cs pocket watch using the Symmetricom SA45s - now how long for a wrist watch !! http://www.engadget.com/2013/05/01/hoptroff-no-10/ Peter (still pendulum controlled) On 20/11/2014 12:38, Bob Camp wrote: Hi So the wrist watch sized fountain that was promised 15 years ago isn’t gong to be here for Christmas this year? Bob On Nov 20, 2014, at 12:17 AM, Magnus Danielson wrote: Hi Rick, They did not mention the complexity of the laser system they needed, especially considering that the optical bench of a fountain isn't all that small, and also because they want to de-tune lasers. While they seems to have an idea, they didn't touch on that subject. Nice to see that people think in a different way thought. Looking forward to see the progress on this one. Cheers, Magnus On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: See: http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 Any comments? Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
The article says: "What time is it? The answer, no matter what your initial reference may be — a wristwatch, a smartphone, or an alarm clock — will always trace back to the atomic clock. The international standard for time is set by atomic clocks — " I always thought "atomic" clocks are maintained by NIST and used as the primary standard for frequency. Whereas time is maintained by USNO. John WA4WDL "Richard (Rick) Karlquist" wrote: > See: > > http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 > > Any comments? > > Rick Karlquist N6RK > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
On 11/19/14, 9:17 PM, Magnus Danielson wrote: Hi Rick, They did not mention the complexity of the laser system they needed, especially considering that the optical bench of a fountain isn't all that small, and also because they want to de-tune lasers. While they seems to have an idea, they didn't touch on that subject. Nice to see that people think in a different way thought. Looking forward to see the progress on this one. Cheers, Magnus On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: See: http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 Any comments? And, of course, the article being cited in the news release is behind a paywall.. I'm always a bit cynical when I see the words like "We have a path toward making a compact, robust clock that’s better than CSACs by a couple of orders of magnitude, and more stable over longer periods of time.”" and "potentially the size of a Rubik’s cube." That "path towards" Having watched the progress of the SpaceClock/1 Liter Atomic Clock/Deep Space Atomic Clock (all names for the Hg ion clock).. it's a long long way from "concept sort of demonstrated in the lab" to "device I can buy with a large-ish check" Just reading the abstract, which doesn't give much detail about how "lab bench" this is, I'm going to guess this is at TRL 3 - basic principle demonstrated on a lab bench. The press release is talking about applications at TRL 8 or 9. A finished product.. It's probably 20-30 years away, and getting from lab full of equipment to "Rubik's Cube" (i.e. a liter) is going to be a lot more challenging than those authors think, I suspect. That said, it's neat to see folks pushing in different directions. The other day I was down in a lab under my office and saw a "breadbox sized" unit that can cool some atoms down to 100 picoKelvins in a few seconds with the push of a button. http://coldatomlab.jpl.nasa.gov/ And not too long ago(1995), that was lab full of gear and a team of researchers struggling for days to get it to sometimes, maybe work. http://jilawww.colorado.edu/bec/BEC_for_everyone/ "The current experimental systems were designed by people with a tremendous amount of knowledge and experience in experimental atomic physics, and until now producing a BEC without expertise in ultracold atom trapping has been a daunting task" from http://jilawww.colorado.edu/bec/CornellGroup/JLTP_Lewandowski2003.pdf so, from first demo in a lab in 1995 - which got them a Nobel to cookbook for grad students and post docs and $300k in 2003 to one-off box that has a pushbutton and fits in a locker on ISS in 2015 http://coldatomlab.jpl.nasa.gov/news/CalTest/ has a picture of the box on the shaker table ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
Hi So the wrist watch sized fountain that was promised 15 years ago isn’t gong to be here for Christmas this year? Bob > On Nov 20, 2014, at 12:17 AM, Magnus Danielson > wrote: > > Hi Rick, > > They did not mention the complexity of the laser system they needed, > especially considering that the optical bench of a fountain isn't all that > small, and also because they want to de-tune lasers. While they seems to have > an idea, they didn't touch on that subject. > > Nice to see that people think in a different way thought. > > Looking forward to see the progress on this one. > > Cheers, > Magnus > > On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: >> See: >> >> http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 >> >> Any comments? >> >> Rick Karlquist N6RK >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped
Hi Rick, They did not mention the complexity of the laser system they needed, especially considering that the optical bench of a fountain isn't all that small, and also because they want to de-tune lasers. While they seems to have an idea, they didn't touch on that subject. Nice to see that people think in a different way thought. Looking forward to see the progress on this one. Cheers, Magnus On 11/20/2014 05:24 AM, Richard (Rick) Karlquist wrote: See: http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 Any comments? Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] MIT 2 inch cesium fountain, optically pumped
See: http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112 Any comments? Rick Karlquist N6RK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
