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Index of Subjects Hi Dave and All All pots with some water tend to turn when subjected to a good heat. Try cooking on a small stove out in the woods with a good round bottomed pot. However billy cans - big tomato juice cans for example are more resistant to such movements and for this reason are very good for a camping trip. Cheap too if you show need a new one. Put a wire for a handle. Prehaps its the ring around the bottom that holds them fast. They are always useful if you should desire to call in a moose. It reminds me of the story when once I was in Keji and thought to call a moose on a bog. I went after sundown on an evening with a full moon. It was a nice bog with a brook running through. I had paddled up the brook. At least 2 kms from the nearest camp site. After a bit I gave the billy can call a rub, every beaver in the brook took to slapping their tails. Up and down the brook. Got their attention anyway. Just then I hear a guy hollering at the camp site - "What the **** was that?" The sound travelled good. After 10 minutes or so, I took anyother shot. Same result with the beavers. The guy hollered "There the ******* thing goes again!" and done what only a wise man would do - turned up a radio full blast. Alas no moose. Maybe Daves pot would have brought one out. Have a good winter til camping Paul --- David & Alison Webster <dwebster@glinx.com> wrote: > Dear All, Jan 22, 2007 > I put a saucepan of water onto a piping hot wood > stove tonight and a > few minutes later wondered why someone had left the > bathroom fan on. The > 'fan' turned out to be sound produced by up and down > oscillation of the > saucepan about 10 times a second and with an > amplitude, at the end of > the handle, of about 3 mm. > > The pan has a slightly rounded bottom from > having run out of water > several times and, presumably because the rounding > is a bit lop-sided, > the pan when oscillating also graduallly turns > clockwise as viewed from > above. To start this oscillation, one must set the > pan onto the stove > with the handle up ~one cm from level and with no > sideways slop of > water. Once the oscillation is started then it > continues until the pot > handle rotates around enough to touch the back of > the stove or until the > water starts to ping. > > Some 12 years ago I saw oscillation of this type > involving a larger > pot, which of course also had a rounded bottom, a 7' > long steam box that > was balanced on the pot, a period that (I think) > gradually increased to > about 4 sec and amplitude that gradually increased > to about one foot [at > which point I steadied the box & put a prop under > one end]. > > Having something barely balanced (handle & pot > or box much longer > than pot diameter along with rounded pot bottoms) is > probably a > necessary condition as is a relatively hot surface > but I have yet to > fathom how heat drives the oscillation. Any ideas ? > > It does not appear to be related to surface > tension effects > because adding a drop of detergent to an oscillating > pot had no effect. > It can be difficult to duplicate and may be > dependent upon some subtle > configuration of the rounding that changes with > recent heating and/or > something related to rate of heat transfer (e.g. a > cold pot and a brisk > fire). After starting it 10-15 times without a > hitch, after I first > noticed it, I can not now get a sustained > oscillation. > > Yours truly, Dave Webster, Kentville > > > > ____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com
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