On the 'rec.antiques' newsgroup a while back, there were some questions
about what quartersawn lumber is (which grew into a discussion about
wainscotting). I thought a picture showing how a log is quartersawn might
have been helpful. The one shown on the left is my version of a much
more artistic sketch shown in "Eric Sloane's America" (Promontory Press,
c1956, ISBN 0-88394-061-2).
The idea is, of course, to keep the growth rings of the log perpendicular
to the the plane surfaces of the lumber. Two methods of doing that are
shown here, one is more extravagant with the log. These methods of cutting
the log reduce the likelihood of warping.