"Frank Arthur" wrote in message
.. .
B is stronger because there is enough material strength in the mortise of
the rail.

Actually, with "A" there appears to be more "material" for "strength" at the
top of the rail/stretcher, where you (not "you" personally, but a
non-engineer for sure) would think it would do the most good:

http://www.e-woodshop.net/images/TenonTrial3.JPG

.... and would an 1/8" at the bottom make that much difference?

hmmm....

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Last update: 5/6/06