*From:* neoni...@googlegroups.com <javascript:> [mailto: neoni...@googlegroups.com <javascript:>] *On Behalf Of *Dekatron42
> *Sent:* woensdag 28 augustus 2013 23:29 > *To:* neoni...@googlegroups.com <javascript:> > *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... Regarding the vapour pressure - remember the tubes run reasonably warm when run continuously - lets say the maintaining voltage is 110V @ 2mA (I know it varies a lot), that means you may be dropping 70V @ 2mA = 140mW, enough to warm the tube. Bigger tubes with more current produce correspondingly more heat - I find bigger nixes often run at about 30C. CD47 has a drop of 90V @ 25mA = 2.5W. Nick -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/ac5d7814-17d0-408f-a4b3-b0325a157f12%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
