[time-nuts] Voltage standards

[Brian Kirby]

A cryo may  be hard to put togather  (and maintain - from experience) 
but there are plenty of peltier junctions/devices out there...

Brian KD4FM

Lux, James P wrote:
> Exactly.. I'm sure I'm not the only one on this list that has contemplated home use of liquid helium or even making the stuff.  Hey, if Onnes could do it 100 years ago, so can we.
> 
> I assume the cryogen isn't being used for superconductivity in this case, but for just being cold.  In which case, perhaps LH2 or LN2 would serve almost as well.  The latter, particularly, is pretty manageable (i.e. You don't have to make it yourself).
> 
> Cost wise, I like the snippet I read in Scientific American a decade or so ago.. LN2 is the cost of milk, LHe is the cost of fine scotch whisky
> Is a obsessive precision worth a bottle of scotch?
> 
> Jim
> 
> On 11/30/08 2:13 PM, "M. Warner Losh" <imp at bsdimp.com> wrote:
> 
> In message: <49330CF9.5040205 at xtra.co.nz>
>             Bruce Griffiths <bruce.griffiths at xtra.co.nz> writes:
> : Cryogenic standards arent really feasible for home use as most require
> : liquid helium coolant.
> 
> This has got to be one of the best lines in a time-nuts email :)
> 
> Warner
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