>peeimen- illicit have been drier than tin 1 other, ami WHS therefore 

 Jetieunt in the I'M'iiirni i.f ^ai'-r. i>r that tin 1 ^hnulder- df the weaker 

 specimen, at tlir oii'l at whidi the failure occurred, wore not out very 

 parallel with each other, an 1 tlius tin- i;r,-at<'r part, of the. load might 

 have be. n r m. entr.ited mi one side. 



. A.- a result of the experiments, the average shearing ttmgth of 



|i..n-l;i> Fir in H>s. |MM .-.|iiaiM inch is 411.61, 377.14 or 403.605 

 L-i'imliiiL; 1 a> the |ii:inr of sir ar is tangential, at right angles, or oblique 

 to tin- annular riii^ 



In practice, therefore, it will he safe to adopt as the average co-cffi- 

 eients of shearing strem^th for Doughs Fir. 400 Ibs. per sq. inch for 

 shears tangential and oblique to the annular rin^s, and 375 Ibs. per 

 *.\. ineh fur .-hear> at ri.ulit angles to the annular rinj;-. 



A'tffc. The nuinhers in Brackets at the end .f the total shears in the 

 following Table correspond to the numbers in the diagrammatic sec- 

 'ions, a. d indicate the pjsitiuu in the stick from which the specimens 

 are taken. The letter H designates a specimen taken from the heart 



107 



