[time-nuts] You can build a fountain from the things you find at home...

Robert Darlington rdarlington at gmail.com
Tue Sep 27 19:01:13 UTC 2011

So I find that somewhat surprising (Aluminum as a material for UHV systems)
because they outgas water -for months.  Anodized aluminum is especially
bad!  Did they make any suggestions on cleaning the oxide off before pumping
down and baking?

-Bob (machinist and vacuum nut)

On Tue, Sep 27, 2011 at 12:56 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

> I just finished my Colloquium on leap-seconds at the USNO, and afterwards
> had lunch with Demitriou Matsakis and one of his Fountain building
> physicists.
> Remembering a previous discussion on the topic here, I asked if building
> a fountain would be a feasible amateur project.
> The answer is "yes, if you have enough money".
> The shared wisdom was that you want to build your vacuum vessel out
> of aluminium, which in addition to being a-magnetic also makes it
> possible to bolt the windows in, rather than mounting them by
> welding and that rubidium is a better target atom than cesium.
> Gentlemen, start your lathes...
> --
> 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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