[Homeroast] Monday Morning Cup
theravensroost at gmail.com
Thu Aug 26 11:22:54 CDT 2010
Hmmm, if an implosion is a definite possibility and a reason for the
stovetop vacuum to go out of favor . . . then I am so glad to have my Cona,
with a spirit lamp. The whole process is so gentle. A slow whoooosh. And the
denatured alcohol lasts in the spirit lamp for about 16 mornings of coffee.
I am hoping for this beautiful coffee pot to last forever. Or until I drop
a portion of it. I had one many years ago and sold it when I bought a
sailboat. Now that my husband and I have hung up the anchor, I am enthralled
with the Cona once again. I cannot improve upon perfection. For me, it makes
the perfect cup.
On Thu, Aug 26, 2010 at 8:24 AM, Rich <rich-mail at octoxol.com> wrote:
> Those steam bubbles are an insulator and the glass temp does go up. The
> water in the upper chamber is below boiling. Check its temperature as it is
> higher on the top hat the bottom. The bottom goes down first. There is
> already one lister who has experienced superheat and implosion is next if it
> has not happened already and was not mentioned. These pots went out of
> favor with the masses for many reasons, these are some of them. There is no
> valid reason for a heat burst.
> Allon Stern wrote:
>> On Aug 26, 2010, at 8:13 AM, Rich wrote:
>> There is a potential problem. The "terminal heat burst" increases the
>>> temperature of the bottom of the lower vessel a greater amount over the
>>> water in the upper vessel. This results in a greatly increased stress on
>>> the structural integrity of the bottom of the lower vessel as the cooler
>>> upper vessel water is rapidly applied. A loss of lower vessel structural
>>> integrity is a real probability.
>>> Just because an event has not occurred yet does no preclude the event
>>> happening in the future.
>>> Coffee pot implosion is a shattering event.
>> Boiling water has a hard time making it over it's (adjusted for local air
>> pressure) boiling point. If you don't let the bottom go dry, you're probably
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