64 



ABC OF THE STEEL SQUARE 



to the center) has a 12-foot run and half-pitch 

 the rise would also be 12 feet, and the length of 

 the rafter would be 17 feet (the diagonal of 12). 

 Length, cuts, etc., could all be figured from the 

 one illustration. 



..''i ,-;~ "z.X"oJ.';? *,''".; 5. v; 

 < -C- *;<;' -V :/' >' v^ 



Fig. 34. 



J*lg 34 illustrates a way to cut rafters with 

 the square. 



A roof 14 feet wide would have a run of 

 7 feet, third-pitch would rise 8 inches to every 



