Re: [Phys-l] [tap-l] Liquid helium experiments

[Bernard Cleyet <bernardcleyet@redshift.com>]

That's (thread) was what I thought until I remembered the dewar is  
sealed for pumping.

Hint:  the most troublesome is observation thru the boiling LN2  
jacket.  One may cool the N2 by bubbling H2.  It stays below 76? K  
for a long time, conveniently.

bc  now remembers -- two dewars one has feed thrus for electrical  
(fountain htr.) and mechanical (thread) + ?.  Also less silvered.

p.s. used both resonance and time of flight in a cavity.  I added  
question on Q vs. temperature.


On 2008, Oct 31, , at 09:07, chuck britton wrote:

> Lowering the magnet by a thread is good - but starting with the  
> magnet already in the dish is very dramatic also.