396 



TIMBER AND TIMBER TREES. 



[chap. 



Relatively consideredj these experiments stand as 

 follows : — 



TRANSVERSE STRENGTH. 



Top-length. 



a - a' = -87 

 b ~b< = -95 



Mid-length. 

 a - a' = I'oo 

 i -b> = '95 

 c - c' = '95 



Butt-length. 

 a ~ a^ = '94 

 i - b' = -86 



TENSILE STRENGTH. 



and of the above the relative strength of the series are — 



a' = '952 

 b' = -932 

 c' = I '000 



We find, also, the relative transverse strength of the 

 three lengths is as follows, viz. : — 



and the specific gravity — 



Top-length = '980 

 Mid ,, = "946 

 Butt ,, = I '000 



The tables show that the maximum transverse 

 strength lay in the outer series marked c' - c. It is not, 

 however, certain whether the tree from which they were 

 taken, although reduced to 22 inches square, would not 

 have yielded a much larger square log, say 28 or 30 



