ABC OF THE STEEL SOUARE 



133 



RULE See Fig. 92. 



Blade. Tongue. 



Common Side Rafter 15' 7%" 16' 



Longest Jack " 13' 8" 14' 



6th " " 11' 8y 2 " 12' 



5th " " 9' 9" 10' 



4tk " r 91/0" s' 



3d " " 5' 10" 6' 



2d " " 3' wy 2 " 4-' 



1st " " 1' 11" 2' 



Blade gives Cut of Jacks, also Sheathing. 



These matters have been discussed at length, 

 in trade journals and also in my larger vol- 

 umes on The Practical Uses of the Steel Square, 

 hut the foregoing treatment of the subject is 

 on somewhat different lines and will prove in- 

 teresting. 



John Wilberforce, Toronto, Ont., wants to 

 know if a wreath piece for a single-pitch rail 

 with level landing can be set out with the Steel 

 Square. 



Answer: Yes, the problem can be solved, as 

 follows : 



Set out on a board the plan of the wreath A 

 (Fig- 94?) . Draw the outside circle and the 



