37° 



TIMBER AND TIMBER TREES. 



[chap. 



Table CLII.— Pitch Pine (American). 



Transverse Experiments. — ^rd Exaviple. 



(Butt to top, outer part of the tree. Fig. 32^.) 



Remarks.— No. 13 broke short and split ; 14, curl in the grain and broke short ; 15 

 and 16 broke short and split ; 17 and 18 broke with short fracttire. 



Specimens Nos. 13 to 18, with the later layers or 

 growthjwere taken from the outside of the same plank, the 

 object being to ascertain in the two sets of experiments 

 — Tables CLI. and CLII. — in which part of the length 

 the maximum of strength lay. Table CLI. shows that 

 in the early layers it is in specimen 8, the second piece 

 from the butt- end; and Table CLII. shows that in the 

 wood of later growth it is in specimen 15, the third 

 piece from the butt-end. We also see in the mean 

 results of the experiments that the strength of the inner 

 is to the outer wood as 889 : 970. 



Further experiments on the transverse strength of 

 the inner and outer layers of wood of another Pitch Pine 

 tree were then carried out, with the following results : — 



