Hi RC, Here's some better possibilities for natural CF.
http://www.rexresearch.com/goldfein/goldfein.htm http://www.rexresearch.com/kervran/kervran.htm No doubt others can add other resources to this short list. K. -----Original Message----- From: RC Macaulay [mailto:[EMAIL PROTECTED] Sent: Friday, December 03, 2004 11:24 AM To: [EMAIL PROTECTED] Subject: Re: CF in everyday life Robin, The tile is 1" representing a potential of 1 " water column pressure against the surface of the tile. As the water touches the tile an audible sucking sound occurs indicating a vacuum forms at the surface. A pressure greater than 1" w.c. psid is required to produce an audible sound...... Regarding the water olla temperature, the differential temperature cannot be reconciled using the math I learned in school.. of course, in Texas, there have been cases of finger and toe counting where paper was in short supply. Regards Richard ----- Original Message ----- From: "Robin van Spaandonk" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, December 02, 2004 7:27 PM Subject: Re: CF in everyday life > In reply to RC Macaulay's message of Thu, 02 Dec 2004 15:11:47 -0600: > Hi, > [snip] >>nightime temp of 70 degrees F. The water temperature inside the olla will >>fall to 70 degrees F as it "surrenders " heat to the clay wall of the >>olla. Comparing the differential potential for giving up heat to >>atmospheric conditions external to the olla is usually explained via >>evaporation due to the breeze. There is NO breeze in the desert. The >>lowering of the olla water temperature must be caused by what? > > It is caused by evaporation. Even without wind, the thin layer of air > against the wall of the vessel will be saturated with water vapour, which > makes it lighter than the surrounding air. That makes it rise up, and it > gets replaced by heavier dryer air, which in turn absorbs more moisture > from the vessel. > So this works, even in the complete absence of wind. However even on so > called wind still days, there are usually occasional small air movements, > which help out with the process. > >>The indians dont worry about it.. they just enjoy the fact. >> >>Now consider a 12" X 12" X 1" Mexican Saltillo tile , red clay with small >>amounts of volcanic and flint rock. After firing the tile, it is extremely >>dry. Keep the tile dry but allow it to completely cool and sprinkle a >>small amout of water on the tile and watch it " boil" as it is absorbed >>into the porous tile. Why does the water momentarily boil? > > This "boiling" is more likely to be air bubbling up through the water, as > the water soaks into the porous tile, and replaces the internal air. > [snip] > > Regards, > > > Robin van Spaandonk > > All SPAM goes in the trash unread. > >
