THE WOOD AND ITS MECHANICAL PROPERTIES. 



47 



WEIGHT. 



Figure 12, which includes all the commercial hickories, shows that 

 the work or shock-resisting ability increases in proportion to the dry 

 weight of the wood. The strength at maximum load also appears to 

 increase almost in direct proportion to the dry weight. The deduc- 



S TRENGTH A T MAX/ MUM LOA D 



g | I 









BEND/MG WORK TO MAX/ MUM LOAD 



tion from figure 12 is that hickory may be inspected upon a basis of 

 weight, and the heavier the wood the better. Additional confirma- 

 tion of this is found in figure 13, a which shows that the strength and 



From Forest Service Circular No. 142, "Tests of Vehicle and Implement Woods." 



