24 



A B C OF THE STEEL SQUARE 



"The pitch is the proportion that the rise 

 bears to the whole width of the building. The 

 illustration, Fig. 8, shows one-third pitch ; the 

 rise of 8 feet being one-third of the width of 

 the building. 



*-tCT-W!OC- 



Fig. 8. 



"The cuts or angles of a rafter are obtained 

 by applying the square so that the 12-inch 

 mark on the body and the mark on the tongue 



Fig. 9. 



that represent the rise shall both be at the edge 

 of the rafter. The illustration, Fig. 9, shows 8 

 foot rise, the line A the cut for the ridge end 

 of the rafter and B the cut for foot end." 



The portion of square shown at Fig. 10 

 exhibits the tool having on its face a table of 



