ts_

The order of tests in all cases will be such as to eliminate so
far as possible from the comparisons the effect of changes of
condition of the specimens due to such factors as storage and
weather conditions.

The material used for determining the effect of height in tree
will be tested in such order that the average time elapsing from
time of cutting to time of test will be approximately the same
for all bolts from any one tree.

_Tests on Green Material_

The tests on all bolts, except those from which a comparison of
green and dry timber is to be gotten, will be as follows:

_Static bending_: One stick from each pair. A pair consists of
two adjacent sticks equidistant from the pith, as _N_7 and _N_8,
or _H_5 and _H_6.

_Impact bending_: Four sticks; one to be taken from near the
pith; one from near the periphery; and two representative of the
cross section.

_Compression parallel to grain_: One specimen from each stick.
These will be marked "1" in addition to the number of the stick
from which they are taken.

_Compression perpendicular to grain_: One specimen from each of
50 per cent of the static bending sticks. These will be marked
"2" in addition to the number of the stick from which they are
cut.

_Hardness_: One specimen from each of the other 50 per cent of
the static bending sticks. These specimens will be marked "4."

_Shear_: Six specimens from sticks not tested in bending or from
the ends cut off in preparing the bending specimens. Two
specimens will be taken from near the pith; two from near the
periphery; and two that are representative of the average
growth. One of each two will be tested in radial shear and the
other in tangential shear. These specimens will have the mark
"3."

_Cleavage_: Six specimens chosen and divided just as those for
shearing. These specimens will have the mark "5." (For sketches
showing radial and tangential cleavage, see Fig. 45.)

When it is impossible to secure clear specimens for all of the
above tests, tests will have precedence in the order in which
they are named.

_Tests to Determine the Effect of Air-drying_

These tests will be made on material from the adjacent bolts
mentioned in "_c_" under Part of Tree to be Tested. Both bolts
will be cut as outlined above. One-half the sticks from each
bolt will be tested green, the other half will be air-dried and
tested. The division of green and air-dry will be according to
the following scheme: