Note the use of the deflectometer with indicator and dial for measuring the deflection; also roller bearings between beam and supports.] _Preparing the material_: The specimens may be of any convenient size, though beams 2" X 2" X 30" tested over a 28-inch span, are considered best.

The beams are surfaced on all four sides, care being taken that they are not damaged by the rollers of the surfacing machine.

Material for these tests is sometimes cut from large beams after failure.

The specimens are carefully weighed in grams, and all dimensions measured to the nearest 0.01 inch.

If to be tested in a green or fresh condition the specimens should be kept in a damp box or covered with moist sawdust until needed.