[Homeroast] Monday Morning Cup
rich-mail at octoxol.com
Thu Aug 26 12:53:08 CDT 2010
The last of the Cory pots came with a 750W electric hotplate to control
the heat. Having one of these boil dry and explode is very impressive
when you are young. Spirit lamps or low power electric heat is a much
A bit of googling will bring up a couple sites that show all of the
patent drawings and somewhere there is the old instruction sheet.
cherry carter wrote:
> 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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