STICK NUMBERS

Lower bolt, 1, 4, 5, 8, 9, } Tested
etc. } green
Upper bolt, 2, 3, 6, 7, 10, }

Lower bolt, 2, 3, 6, 7, 10, } Air-dried
etc. } and
Upper bolt, 1, 4, 5, 8, 9, } tested

All green sticks from these two bolts will be tested as if they
were from the same bolt and according to the plan previously
outlined for green material from single bolts. The tests on the
air-dried material will be the same as on the green except for
the difference of seasoning.

The material will be tested at as near 12 per cent moisture as
is practicable. The approximate weight of the air-dried
specimens at 12 per cent moisture will be determined by
measuring while green 20 per cent of the sticks to be air-dried
and assuming their dry gravity to be the same as that of the
specimens tested green. This 20 per cent will be weighed as
often as is necessary to determine the proper time of test.

_Methods of Test_

All tests will be made according to Circular 38 except in case
of conflict with the instructions given below:

_Static bending_: The tests will be on specimens 2" X 2" X 30"
on 28-inch span. Load will be applied at the centre.

In all tests the load-deflection curve will be carried to or
beyond the maximum load. In one-third of the tests the
load-deflection curve will be continued to 6-inch deflection, or
till the specimen fails to support a 200-pound load. Deflection
readings for equal increments of load will be taken until well
past the elastic limit, after which the scale beam will be kept
balanced and the load read for each 0.1-inch deflection. The
load and deflection at first failure, maximum load and points of
sudden change, will be shown on the curve sheet even if they do
not occur at one of the regular load or deflection increments.

_Impact bending_: The impact bending tests will be on specimens
of the same size as those used in static bending. The span will
be 28 inches.

The tests will be by increment drop. The first drop will be 1
inch and the increase will be by increments of 1 inch till a
height of 10 inches is reached, after which increments of 2
inches will be used until complete failure occurs or 6-inch
deflection is secured.

A 50-pound hammer will be used when with drops up to 68 inches
it