A B C OF THE STEEL SQUARE 



93 



Therefore, by taking the runs on the tongue, 

 as shown by the squares Nos. 3 and 4, will give 

 their lengths, seat and plumb cuts. 



In Fig. 61 is shown the intersection of the 

 rafters at the peak and as the lengths of all 

 rafters are scaled to run to a common center it 

 is necessary that the common rafters must cut 

 back so as to fit in the angle formed by the hips. 



Fig. 61. 



Tlie proper deduction for this is shown in Fig. 

 150 by placing two squares on the back of the 

 rafter, with the heel or corner of the squares 

 resting on the center line. The distance from 

 the corner of the square to B measured square 

 back (at right angles) from the plumb bevel, as 



