Table 1. -- Results of mechanical teats on Lophlra procera— conducted by the Imperial 
Institute, London (22) 
Mechanical test 
Results 
Maximum 
Minimum 
Mean 
Static bending: 
Maximum calculated longitudinal 
shear lb . per sq . in . 
Fiber stress at elastic 
limit lb . per sq . in . 
Modulus of rupture lb . per sq . in . 
Modulus of elasticity lb. per sq. in. 
Work in bending to elastic 
limit in. -lb. per cu. in. 
Work in bending to maximum 
load in . -lb . per cu . in . 
per sq. in, 
Compression parallel to grain: 
Fiber stress at elastic 
limit lb 
Maximum crushing 
strength lb . per sq . in . 
Modulus of 
elasticity lb. per sq. in. 
Compression perpendicular to grain: 
Fiber stress at elastic 
limit lb . per sq . in . 
Shearing parallel to grain: 
Shearing strength: 
Radial lb . per sq . in . 
Tangent ial lb . per sq . in . 
Cleavage : 
Splitting strength: 
Radial lb . per inch width 
Tangential lb. per inch width 
Tension perpendicular to grain: 
Tensile strength: 
Radial lb . per sq . in . 
Tangent ial lb . per sq . in . 
Hardness: 
Load required to imbed a 0.444-inch-diameter 
steel sphere to a depth equal to one -half 
its diameter: 
Radial surface 
Tangential surface .... 
End surface 
Specific gravity 2 -.... 
Moisture 
Weight per cubic foot. 
lb. 
lb. 
lb. 
.percent 
lb . 
896 
15,420 
25,460 
3,000,000 
4.12 
44.6 
10,260 
11,610 
3,388,000 
2,870 
2,650 
2,790 
682 
869 
1,452 
2,315 
4,i4o 
3,980 
4,650 
0.968 
20.8 
70.5 
693 
11,960 
19,400 
2,240,000 
2.82 
16.5 
6,700 
8,990 
1,674,000 
2,140 
1,680 
2,460 
389 
603 
813 
1,140 
3,430 
3,580 
4,010 
0.872 
12.2 
65.6 
810 
13,850 
22,870 
2,732,000 
3.56 
33-5 
8,470 
10,450 
2,734,000 
2,420 
2,335 
2,652 
483 
727 
1,226 
1,884 
3,810 
3,810 
4,310 
0.930 
17.3 
68.5 
■^The material used was two air-dry planks, 10 feet long, 33 inches wide, and 3 inches thick. 
p 
—Based on weight when oven-dry and volume at test. 
Report No. R1913 
