90 



ABC OF Till-: STEEL SQUARE 



If we were to use 12 on the tongue for a foot 

 run of the hip the rise to the foot would neces- 

 sarily be less than 10 inches. In Fig. 59 I show 

 what the difference is in rise to the foot. 



M 



\2.^ 

 "*T ... i t t i i I 



Fig. 59. 



From 12 to 12 is the length of the run of the 

 hip would only have 10-17 of an inch to one 

 run of the common rafter, and an equal rise of 

 the common rafter, set off as at A, and a line 

 from this to 12 on the tongue passes at 7 1-17 



