A B C OF THE STEEL SQUARE Ti 



The one-half pitch can be found in the same 

 manner by using* the decimal .71. Taking the 

 24-foot building, length of rafters by the hy- 

 pothenuse, we find 16 feet, 11 2-3 inches; my 

 way they would be 17 feet full. Again, build- 

 ing 60 feet wide, rafters by the first method 

 would be 42 feet, 6% inches; by my way 60 X 

 .71=42 feet, 6 inches. By using this decimal, 

 the length is so near practically correct, that 

 it may be used in all cases. 



For a full pitch use the decimal 1.12, and as 

 in the preceding mentioned pitch, and it will be 

 found so near correct that it can be practically 

 used in all cases. 



It will be noticed that I have not made any 

 allowance for projection of rafters over the 

 plate. In this case gauge from the crowning 

 side of your rafter the thickness of your projec- 

 tion; allow enough for the latter, and find the 

 lower bevel according to the way you describee 

 in your last; measure the length of your rafte: 

 from where this bevel crosses the gauge line. 



A little practice will enable the mechanic to Is / 

 off a rafter in a very short time. I have us d 

 the above myself, and have no trouble whatever. 

 While I have no fault to find in your methods, 

 as I know them to be correct, yet it is just as 

 well that workmen should know other methods, 



