84 



A B C OF THE STEEL SQUARE 



The measurement line of hips and valleys is 

 at a line along the center of its back, and just 

 where to place the square on the side of the 

 rafter so as to make the cuts and length come 

 right at that point is a question that taxes the 

 skill of most carpenters, especially so when the 

 rafters are so backed. In Fig. 54 I have tried 

 to make the above points clear. 



/\ x PLAN 



/ i- -X 17' * 



Fig. 54. 



First, I show the plan of the rafter. The 

 cross lines on same represent an external corner 

 for the hip and valley respectively. Above the 

 plan is shown the elevation. The sections 

 1-2-3-4 represent the position of the rafters 



