A B C OF THE STEEL SQUARE 



129 



on the tongue and the length of the hip on the 

 blade, Fig. 90, and the blade will give the bevel 

 of the hip to lie against the ridge. As a general 

 rule, hip rafters are not backed, but if such is 

 desired the lines for backing can be found by 

 setting it to the foot cut of the hip rafter. Make 



T R 



10 it u is i 



u it 11 tt ts 



Fig. 90. 



O R square with S O and gauge back as shown 

 in the diagram A. Do the same on the other 

 side, using the distance T R instead of P S. 

 The point O is of course at the center of the line 

 T P. For lengths and bevels of jacks, pro- 

 ceed as follows : For end of roof, and set 2 feet 

 on centers, take a board and apply the square 



