VARIOUS FORMS OF FAILURE. 



45 



SHEARING. 



When, in a structure like that shown in fig. 30, a weight is placed on 

 / and the tenon I by downward pressure breaks out the piece A B t V 7 



_ 





lie 



1 

 1 



3200 



■ : ii\>. 



id 



A 



B 



116 

 



4 



*> 







D 



3 



tf 



# 



C, shearing (the holt of a stirup 

 The lower figure indicates tbe 



Fig. 31. -Various forms of failure. A and B, compression endwise; 

 massed throueh the mortise and sheared out tbe endi. 1>, tension. 



No. 116 (upper figure on each piece) is white pine, Nos. 1, 2, and 5 are longieai pine, 

 natural size. 



