Francis
A framing square will only indicate the portion of the jamb that it is in contact with is plumb IF the floor is truly level. You need an appropriately sized (6'6" being the standard) level to determine if a jamb is plumb. Even then, most jambs aren't perfectly true with regards to being a perfectly straight even surface.
Cheers
Marcus
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"Nowadays, when one is forced to cross the country in a few hours and drink three-day-old beer, ain't it a pleasure to know, as I'm sure you do, that good friends, good bourbon, and good tobacco are slowly made."
Gene Hill
www.cure.org
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