I see.. That taking a known volume could really work. But it is difficult to use it directly in the tube (capillary with both ends open and a drop of mercury), the mercury would evaporate during pumping messing the vacuum system with vapours of mercury.. not good.
Dalibor 2013/8/30 JohnK <[email protected]> > ** > Am I missing something here ? - the capillary is open both ends and gets > pumped down with the tube doesn't it, so air doesn't matter. > > Or, are sealed ampules always made? > I follow that a capillary can be used to gather up a known amount > 'automatically'. Is that then emptied [blown?] into something else or used > open or used sealed etc. > > Some more detail please.... > John K. > > ----- Original Message ----- > *From:* Dalibor Farný <[email protected]> > *To:* [email protected] > *Sent:* Friday, August 30, 2013 6:35 PM > *Subject:* Re: [neonixie-l] Re: Something for the tube/nixie making > people? > > > > > 2013/8/30 Nick <[email protected]> > >> *From:* [email protected] >> [mailto:neoni...@**googlegroups.com<[email protected]>] >> *On Behalf Of *Dekatron42 >> >>> *Sent:* woensdag 28 augustus 2013 23:29 >>> *To:* [email protected] >>> >>> *Subject:* Re: [neonixie-l] Re: Something for the tube/nixie making >>> people? >>> >>> If I remember correctly there is at least one patent on Nixies that >>> mentions 2.5mg and/or 3.5mg of mercury, and it also discusses several >>> methods of releasing the mercury from the small glass capsules - I can't >>> find the patent right now but I think it was a patent by Burroughs as I >>> remember that one picture showed exactly how they have done it in their >>> B5092 Nixie. >>> >>> >> ISTR that this was done by having the Hg in a small piece if glass >> capillary tube (a few mm long, maybe 4mm?) and released by induction >> heating. This is how the Hg was measured too - just dip the end of the >> small capillary tube in to a pool of Hg and a standard amount is drawn up. >> You can see these empty capillaries in the bases of some larger tubes... >> >> >> > > There should not be any air in the capillary, You have to prepare a > procedure on its end will be a small sealed capilalry tube with tiny drop > of mercury but *without* air, just a vapours of mercury. Once cubic > millimeter of air will have a volume of 40 cubic millimeters in a tube with > pressure around 20torr and that would certainly lead to shorter lifetime.. > The getter could take care about it, but it is quite clumsy solution. > > > -- > Dalibor Farny > http://dalibor.farny.cz > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send an email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CA%2BnkT5pkORaG0Fnj6ztiahcdBeaj7gohazijqHWY%3DUN8RXG9%3Dg%40mail.gmail.com > . > > For more options, visit https://groups.google.com/groups/opt_out. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send an email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/7DCB2CEDD9474938A2FE64CB914DE9C8%40compunet4f9da9 > . > > For more options, visit https://groups.google.com/groups/opt_out. > -- Dalibor Farny http://dalibor.farny.cz -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CA%2BnkT5puxThZgs4SS1yUHKdSE3d%3Dpj1kCqwCZT-oTKe-Pf1R1Q%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
