ABC OF THE STEEL SQUARE 

 Fig. 64. 



Fig. 65. 



pose the roof to have a span of 18 feet and a 

 rise of 6 feet, thus giving the roof a one-third 

 pitch. The fence is used in this example to its 

 full extent, and when placed on the square and 

 fastened, the line of fence shows the slope or 



