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Old January 27, 2013, 09:12 AM   #3
Doc Hoy
Senior Member
 
Join Date: October 24, 2008
Location: Chesapeake, VA
Posts: 4,587
Hawg,

The chart stops at a hardness of 8 on the bottom end.

So I did up an Excel spreadsheet and extended the lower end to 5.9.

It turns out it is a perfectly linear progression, so it would have been easier just to do the computation from the sheet. Oh well. I have something else to hang on the wall in my shop.
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My reading of history convinces me that most bad government results from too much government. Thomas Jefferson
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