876 



Mr. H. Carringto'n on Young* s" Moduli 



Although no connexion between the properties for a 

 particular balk could be found, it seemed probable that 

 relations might exist between the means of the properties 

 corresponding with each balk. A consideration of the table 

 of results resulted in the curves shown in figs. 2 and 3. 



Fig. 2. 



Rebhon between Ez » Ex.Sx ? Eij.5tj ,&tti&Densih j Ihu 



10 £0 



.Density dry (ibspercu fr) 



Here Sa? and S^ denote the shrinkages in the direction 

 XOX and YOY respectively per unit length of dry timber, 

 corresponding with 12 per cent, of moisture. Referring to 

 fig. 2, it will be noted that the relation between E~ and the 

 dry density is linear, also that the relation between E tT S a -, 

 E iV S y , and the density dry is represented by one straight line. 

 Further, these lines intersect on the abscissa. Similar 

 relations are shown to exist in fig. 3 between values of 

 Poisson's Eatio, the shrinkages, and the drv densities. All 



