[time-nuts] You can build a fountain from the things you find at home...
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
> 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.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> and follow the instructions there.
More information about the time-nuts