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the piece and among pieces. In the OSU
study, the average specic gravity for
each species differed from the individual
sample by plus or minus 1% to plus or
minus 8%. For general applications,
average specic gravity values can be
found in the Wood Handbook (USDA
Agriculture Handbook No. 72, 1999).
Except for one species for which the
experimental value is 7% higher, the
species’ overall average specic gravity
values obtained in the OSU study are
comparable with those in the Wood
Handbook. The exception may be caused
by unknown biases in the sampling
scheme. The Wood Handbook values are
used in the tables, except for the imported
species, unless otherwise noted.
Species adjustment can be determined
for lumber sorted, or otherwise known,
to have specic gravity different from the
species’ average. One example is lumber
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