"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

What's wrong with this one?
http://www.polsteins.com/pinglasvacbo.html

or this one:
http://housewares.aubuchonhardware.c.../thermos_bottl
es/glass_vacuum_bottle-624462.asp

or this one:
http://shop.store.yahoo.com/applianc...r155ozvac.html

or this one:
http://hectorshardware.com/therstanun.html
(look for 624462)


But as far as that goes, the whole point of a dewar is that you lose heat by
conduction only across the very small area at the neck. (And through the
stopper, of course) If the stainless is as shiny as the aluminum on the
glass, you shouldn't lose any more by radiation than a glass flask.
Do you have some indication that the stainless dewars are significantly
worse than glass? i.e. claims that they keep a liquid hot or cold for
longer.
Demonstrably, your foam capacity wasn't good enough, but how different is
the stainless model?

Tim Ward