14 



A B C OF THE STEEL SQUARE 



"The face of a square is the side o 

 which we stamp our name. The reverse 

 is the back. The longer arm is th, 

 body, the other is the tongue. 



Frammg Rule. The first line of 

 figures gives the length of common 

 rafters for one foot run. 



The second line of figures gives the 

 length of hip or valley rafters for one 

 foot run. 



The third line of figures gives the 

 length of first jack rafter and the dif- 

 ference in the length of the others 

 spaced 16 inches on centers. 



The fourth line of figures gives the 

 length of first jack rafters and the dif- 

 ference in the length of the others 

 spaced 2 feet on centers. 



The fifth line of figures gives the 

 side cut of jack rafters against hip or 

 valley rafters. 



The sixth line of figures gives the 

 side cut of hip or valley rafter against ridge 

 board or deck. 



Fig. 1. 



