[time-nuts] Used Hydrogen Maser

[Bill Notfaded]

Let me know when I can buy one please!  I'm not kidding.  ;^}

Bill in Arizona

On Sat, Feb 6, 2021, 1:25 PM Tom Van Baak <tvb at leapsecond.com> wrote:

>  > ptti/1981papers/Vol%2013_30.pdf
>
> Note the dialog on the last page. Dave Wineland went on to win the 2012
> Nobel prize in Physics:
>
>
> https://www.nist.gov/nist-and-nobel/dave-wineland/person-behind-nobel-prize-dave-wineland
>
> The first photo is fun, "Before he was a quantum mechanic...". Then
> there's this recent press release:
>
> https://around.uoregon.edu/wineland
>
> The lovely photo of NBS-6 (NIST cesium clock) comes from:
>
> https://www.nist.gov/image/img044jpg
>
> And for a nice trip through the past, including NBS-1 and NIST-7 see:
>
> https://www.nist.gov/si-redefinition/second/second-past
>
> /tvb
>
>
> On 2/6/2021 10:05 AM, Attila Kinali wrote:
> > Moin,
> >
> > On Wed, 10 Jul 2019 10:55:07 -0700
> > "Richard (Rick) Karlquist" <richard at karlquist.com> wrote:
> >
> >> FWIW, about 20 years ago, Len Cutler and Robin Giffard of 5071A fame
> >> built several Hg ion clocks to be shipped to some govt customer I
> >> don't remember.  One of the clocks was dropped by the shipping company
> >> UPS or FedEX) and destroyed.  Only then did Len learn that HP was
> >> self insured, probably as part of a package deal to get a low
> >> corporate shipping rate.  HP products were packed extremely well, so
> >> the only real risk was the unit getting stolen.  I vaguely remember
> >> Len saying they were out $10K, which was probably just the cost of
> >> parts.  Nevertheless, it didn't seem like building an Hg clock was
> >> all that big of a project.  Way simpler than the 5071A.
> >> Now a days, the electronics would be considerably easier and cheaper.
> >> The mechanical parts would all be CNC'ed by an online machine shop.
> > Magnus just send me out to chase an (unrelated) paper and I stumbled
> > over [1] which describes the Hg standard that Cutler & Co built.
> > Remembering this discussion I thought it might be interesting to
> > some.
> >
> >
> >                       Attila Kinali
> > "Trapped Mercury 199 Ion Frequency Standard", Cutler,
> > Giffard,  McGuire, PTTI, 1981
> > http://time.kinali.ch/ptti/1981papers/Vol%2013_30.pdf
> >
>
>
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