Summary of Results of the Mechanical Tests on Afara Wood 
( Terminal ia sup orb a ) from Nigeria (l) 
A. — Transverse bending test (central loading) J 
Maximum Minimum Mean 
Maximum calculated longitudinal 
shear Lb./sq. in. 367*5 187. 5 286.5 
Modulus of rupture Lb./sq. in. 10,230 5,225 7,9b8 
Fibre stress at elastic limit. Lb./sq. in. 7.850 ^,138 .6,229 
Modulus of elasticity Lb./sq. in. 1,3^5,000 1,192,000 1,272,000 
Elastic resilience Inch-lb. /cu. in. 22.3^ 0.679 1«70 
B. — Compression test along the grain (2U in. 
length specimen): 
Crushing strength Lb./sq. in. 6,000 5,260 5,620 
Fibre strength at elastic 
limit Lb./sq. in. 5,1+75 U.125 *+,6l0 
Modulus of elasticity Lb./sq. in. 1,233,000 1,213,000 1,223,000 
Elastic resilience Inch-lb. /cu. in. 10*28 5*9^ 7*U6 
C. — Compression test along the grain 
(8 in. length specimen): 
Crushing strength Lb./sq. in. 5,888 5,^75 5»738 
Fibre strength at elastic 
limit Lb./sq. in. U.625 ^,500 U.567 
Modulus of elasticity Lb./sq. in. 1,285,000 1,100,000 1,198,000 
Elastic resilience Inch-lb. /cu. in. 7'*+5 6*^9 6«87 
D. — Compression test across the grain: 
Load at elastic limit Lb. ^,700 U.200 ^,H00 
Fibre stress at elastic limit. Lb./sq. in. 1,175 1,050 1,098 
E. — Shearing tests along the grain: 
Radial — 
Maximum load supported Lb. *J-,710 k,^kO H,640 
Shearing strength Lb./sq. in. 1,178 1,135 1,160 
Tangential — 
Maximum load supported Lb. 6,1^0 6,050 6,100 
Shearing strength Lb./sq. in. 1,535 1,513 lf525 
Specific gravity 0*515 O'k^k 0*Hg6 
Weight per cubic foot Lb. 32*2 28»U 30. k 
Moisture Percent 11*37 9*85 10 * 29 
Report No. R177S ~^~ 
