From: <Rick.Sylvia_at_ferguson.com> > Currently, I've got a lanyard attached to the thermometer, and I just drop it > overboard and drag it along for about 10 minutes. When I drag it, it's only > about an inch underwater. It's got holes in the top and bottom, so it gets > water flowing through it as it's dragged along. Ten minutes could be overkill, but it depends on the mass of the thermometer and how quickly it would reach equilibrium with the water. WRT depth, I think an inch is too shallow for nonmoving water. Surface temps can be appreciably higher on a lake than just a foot below. If you have swum in quiet water you'll have a sense of what I mean. Moving water in a stream can mix readily, so a surface temp might be representative. You might do either of two things. Put a weight on the end of the thermometer (maybe a coupla ounces) to keep it at a better depth, perhaps a foot. Alternatively (and I've done this on many occasions) take a goodsized mason jar and scoop up the water from a foot below and drop the thermometer in it. There won't be a significant temperature change for the length of time that you'll need for the thermometer/water system to equilibrate. --Done this kind of thing many times when working out dissolved oxygen readings... Joe P. *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Fri Jul 05 2002 - 16:38:22 PDT
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