ABC OF THE STEEL SQUARE 



87 



Fig. 56 illustrates side cut of the octagon 

 jack, 5 on the tongue and 15 on the blade. 



Fig. 56. 



Fig. 57. 



Fig. 57 illustrates the side cut of the hip or 

 valley, 17 on tongue, lO 1 /^ (length of the hip) 

 on the blade giving the cut in each case. 



The latter, however, is for the unbacked 

 rafter. If it has been previously backed, then 



