20 BULLETIN" 15 00, U. S. DEPARTMENT OF AGRICULTURE 
BUTT - ENP TO ENP 
SCARF 
SERRATE or FINGER 
BUTT -ENP TO SiPE 
MITER 
MORT/SE anp TENON 
/( BLOCKEP 
POWEL 
TONGUE MP GROOVE 
Figure 2, — Types of butt-joint construction 
