"Bill Daniels" wrote in message
...

"Bill Daniels" wrote in message
...

"Mike Borgelt" wrote in message
Vacuum.

Use a glass wall vacuum flask. Fill with copper pot scourers.
See Reichmann for a complete explanation of why this is a good idea.

Mike Borgelt


I agree, but I can't find a source of half liter glass vacuum flasks.
The
consumer variety are stainless steel these days.

Bill Daniels


I just fat fingered the delete of a post from Tim Ward (I think) with some
links to 1 Pt. glass vacuum bottles. Anyway thanks for the links.

As for the stainless steel vacuum, bottles, I had tested them way back on
another project involving liquid nitrogen and they were far inferior to
the
glass bottles. The LN2 would evaporate from the stainless ones three
times
faster than from the glass dewars. On the other hand, they were a lot
more
rugged.

Bill Daniels


Yep, it was me.
I just Googled for "vacuum bottle" glass pint

A factor of 3 does seem significantly faster.
On a slightly different subject, I keep seing references to "Chore Girl"
copper scrubbers, and yet all I can find to buy is "Chore Boy" copper
scrubbers.
It's not that I think the name will make a difference, but it makes me
wonder when the name changed and why.

Tim Ward