[time-nuts] Used Hydrogen Maser

[Tom Van Baak]

 > 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
>