the shrinkage and checking near the end of the
bolt.)

One of these specimens will be cut with its width in the radial
direction and will be used for the determination of radial
shrinkage. The other will have its width in the tangential
direction and will be used for tangential shrinkage. These
specimens will not be surfaced.

_Marking_: The shrinkage specimens will retain the shipment and
piece numbers and marks of the bolts from which they are taken,
and will have the additional mark _7_R or _7_T according as
their widths are in the radial or tangential direction.

_Shrinkage measurements_: The shrinkage specimens will be
carefully weighed and measured soon after cutting. Rings per
inch, per cent sap, and per cent summer wood will be measured.
They will then be air-dried in the laboratory to constant
weight, and afterward oven-dried at 100 deg.C. (212 deg.F.), when they
will again be weighed and measured.

VOLUMETRIC SHRINKAGE AND SPECIFIC GRAVITY

_Specimens_

_Selection and preparation_: Four 2" X 2" X 6" specimens will be
cut from the mechanical test sticks of each "_d_" bolt; also
from each of the composite bolts used in getting a comparison of
green and air-dry. One of these specimens will be taken from
near the pith and one from near the periphery; the other two
will be representative of the average growth of the bolt. The
sides of these specimens will be surfaced and the ends smooth
sawn.

_Marking_: Each specimen will retain the shipment, piece, and
stick numbers and mark of the stick from which it is cut, and
will have the additional mark "_S_."

_Manipulation_: Soon after cutting, each specimen will be
weighed and its volume will be determined by the method
described below. The rings per inch and per cent summer wood,
where possible, will be determined, and a carbon impression of
the end of the specimen made. It will then be air-dried in the
laboratory to a constant weight and afterward oven-dried at
100 deg.C. When dry, the specimen will be taken from the oven,
weighed, and a carbon impression of its end made. While still
warm the specimen will be dipped in hot paraffine. The volume
will then be determined by the following method:

On one pan of a pair of balances is placed a container having in
it water enough for the complete submersion of the test
specimen. This container and water is balanced by weights placed
on the other scale pan. The specimen is then held completely
submerged a