A B C OF THE STEEL SQUARE 



79 



and the person who attempts to answer it. This 

 is one of the main reasons why I have admitted 

 into this work various methods and descriptions 

 of others than myself, so that readers will have 

 the same methods described &nd explained to 

 them in several different ways by several writers. 

 Let us take thr diagrams shown at Fig. 49, 



Fig. 49. 



which shows a portion of a roof having a quar- 

 ter pitch. CEB showing the height, and AB the 

 length and inclination of rafter. D shows the 

 foot of the rafter on the plate, cut "flat foot" 

 and the line EC the plumb cut. This is quite 

 plain. The building may be any width, let u* 

 say in this case, that it is 30 feet wide from A 

 to O. That will mak- the distance from A to C 

 15 feet. 



A method of obtaining the bevels for this 

 rafter is given in Fig. 50 where the steel square 



