16 A B C OF THE STEEL SQUARE 



will work in all cases regardless of width of 

 buildings. 



3. On the third line under 8 are the figures 

 19^/4 inches. This is the length of first jack 

 rafter, also the difference in the length of the- 

 others spaced 16 inches on centers. For ex- 

 ample, the first jack being 19^4 inches, the 

 second jack would be 3 feet 2 1 /-> inches; make 

 each one 19*4 inches longer than the other. 



On the fourth line under 8 are the figures 2 

 feet 4% inches. This is the length of the first 

 jack rafter, and the difference in the length of 

 the others spaced 2 feet centers. 



On the fifth line under 8 arc the figures 10 

 and 12- By placing square on stock to be cut 

 at these figures 10 on body, 12 on tongue, and 

 marking on 12 side this gives side cut of jacks 

 against hip or valley rafter. 



On the sixth line under 8 are the figures 9 and 

 10. By placing square on stock to be cut at 

 these figures, 9 on body and 10 on tongue, and 

 marking on the 10 side, this gives side cut of 

 hip or valley rafter against ridge board or deck. 



On the seventh line under 8 are figures 12 and 

 10. By placing square on stock to be cut at 

 these figures 12 on body, 10 on tongue, and 

 marking on the 10 side this gives the cut of 

 sheathing and shingles in valley or hip. 



