[time-nuts] backfill

Bob kb8tq kb8tq at n1k.org
Fri Jun 9 09:55:38 EDT 2017


My guess is that crystals are more sensitive to moisture than the alternators…. The level of “clean” 
you need in a precision crystal enclosure is way beyond what is required in a number of other areas.
One layer of water molecules is way to much in a modern crystal.  can and do use crystals as detectors 
of low levels of “stuff” for this very reason. 


> On Jun 9, 2017, at 2:55 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> Bob wrote:
>> In this case hydrogen + oxygen (like from oxidized metal) goes to H20. You very much do
>> not want water running around inside your crystal holder… Helium is inert.
> The insides of mains alternators are almost entirely metal -- tons and tons of copper tubing, and the casings and rotor shaft are steel.  And the alternators must operate at a relative humidity of absolute zero. The problem is far from insurmountable, even at that huge scale. Dealing with it should be very much easier at a scale of cubic centimeters.
> They use condensers to remove the water during the hydrogen purge cycle, which (for mains alternators) lasts several weeks.  I watched the procedure several times 25 years ago, but I don't recall the particulars now.
> Best regards,
> Charles
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