A B C OF THE STEEL SQUARE 95 



shown in Fig. 61, will locate the point of the 

 long common rafter at B in Fig. 61. Proceed 

 in like manner for the short common raf ter> 

 taking the distance from the corner at C, and 

 for the side cuts, take 14 on the tongue and the 

 length of the short common rafter CE on the 

 hlade the blade will give the cut at AC in Fig. 

 61. The reader will observe that this angle 

 is the same as that for the side cut of the jack. 

 Proceed in like manner for the long common 

 rafter side, using 9 on the tongue and BE on 

 the blade. These same figures will give the side 

 cuts of the hip, provided hip has been previously 

 backed. Taking the last for example the reader 

 will observe that 9 on the tongue and BE on 

 the blade the square would lay on the plane of 

 the backing and the blade giving the cut along 

 the line BB in Fig. 61, or these cuts may be 

 found by measuring square back from a plumb 

 bevel at points A and A, Fig. 62, the distance 

 AC and AB, which will give the proper plumb 

 cut at the sides and intersecting the line A A at 

 the center. These same distances, AC and AB, 

 but transferred to opposite sides, set off on the 

 seat cut or a line parallel with it, will give the 

 gauge points on the side of the hip for the 

 backing. 



The lengths of the jacks may be found by 



