ABBREVIATIONS EMPLOYED 121 



/^= Tensile strength or tenacity along tlie fibre, in tons per 

 square inch. 



c= Direct cohesion, in pormds per square inch. 



c'= Cohesion compared with Oak as 1-00. 



/c- Crushing strength along the fibre, in tons per square inch. 



^'= Crushing strain as compared to Oak as 1-00. 



fs= Shearing resistance along the fibre, in tons per square inch. 



R= Modulus of rupture for transverse strain, stated either in 

 kilograms per square centimetre, or in pounds per square inch. 



