XVIII.] 



HORNBEAM. 



i6i 



ternal moisture and parasites. This renders it unfit for 

 many purposes where a clean, bright surface is required, 

 and generally it proves detrimental to the quality and 

 durability of the timber. 



This wood when subjected to vertical pressure can- 

 not be completely destroyed, its fibres, instead of break- 

 ing off short, double up like threads, a conclusive proof 

 of its flexibility and fitness for service in machinery. 



Suitable specimens could not be secured of the 

 standard dimensions to test the transverse strength of 

 this wood, and consequently only the tensile and crush- 

 ing or vertical strains appear in the tables. 



Table XLIV. 

 Tensile Experiments. 



Table XLV. 

 Vertical or Crushing Strain on cubes of 2 inches. 



M 



