Load in 100-pound units. 
498 
The Philippine Journal of Science 
1921 
Compression in inches. 
‘OJ 0.2 0.3 
HARDNESS 
Hardness is tested by measuring the load required to embed 
a 0.444-inch ball to one-half its diameter in the wood as shown 
in fig. 10. 
The hardness test is applied to end and side surfaces of the 
timber. End hardness is usually greater than side hardness- 
The quality is important in woods to be used for paving blocks, 
railroad ties, furniture, flooring, etc. 
