[time-nuts] A small piece on HP's hydrogen maser in 1968

[Mark Kahrs]

So what's all this about a Thallium Beam Tube???

(Isn't Thallium incredibly toxic?)

n.b. One of the pictures references a Th beam tube...



On Tue, Feb 25, 2014 at 2:46 AM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

>
> > [Jim Lux]
> > Wasn't that Gravity Probe B.. which finally launched in 2004, and had
> > equivocal results.
>
> No, GPB was the gyro-experiment, it tested another part of GR than
> red shift was supposed to.
>
> > [Tony Greene]
> > In the back of my head, I beleive that project red shift did fly,
> > but they dumped the hydrogen masers to use brand new lighter weight
> > and much smaller rubidiums.
>
> I've found no trace of it.
>
> Are you sure you are not confusing it with the pathfinders for NavStar ?
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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