[time-nuts] Voltage standards

[Poul-Henning Kamp]

In message <49333DF9.9060804 at bellsouth.net>, Brian Kirby writes:

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

You need LHe for superconductivity and a cryo is damn hard to put
together, if you don't want to spend a lot of money buying LHe.

This is the size of cryo used by the metro labs:

	http://www.ipht-jena.de/photonische-instrumentierung/abteilungen/quantendetektion/anwendungen/voltage-standard.html

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