A calculatutorial, relatively speaking. There is lots of information on this out there in the cyber-bog. http://www.usatoday.com/weather/whumcalc.htm http://www-das.uwyo.edu/~geerts/cwx/notes/chap06/regnault.html The formulas for the spreadsheet I offered came from the "Wood Handbook, Wood as an Engineering Material", as I recall. Ron N
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