CHOICE OF SECTIONS 



3 2 9 



sizes of sections in use by the American Bridge Company, are given in 

 the following table. 



Standard Angles. 

 6" x 6" 6" x 4" 



4' x 4" 5" x 3; 



3/ 2 " x 3 / 2 " 4" x 3" 



3" x 3" 3^" x 3' 



8" 

 5" 



Permissible Angles. 

 x 8" 6" x 3^' 



x 5" 4" x 3 / 2 ' 



X 2 y 4 " 3 



X 2" 



X 

 X 2 



2 



: 2.y 2 " 3" x ^y^ 



2^" X 2" 



Standard Channels. 

 15" 8" 



12" 6" 



10" 



Standard I Beams. 



20" 

 18" 



15" 

 12" 



10" 

 S" 

 6" 



Permissible Channels 



Permissible I Beams. 



24;; 



7" 



6" 



Permissible Tees. 



3" x 3" x 3/ 8 " 2" x 2" x 5-16" 



Permissible Zee Bars. 



5" 4" 3" 



Standard Flats. 



3" 6" 12" 



3/2" 7" 14" 



4" 8" 



4/2" 9" 



5" 10" 



Standard Rounds. 



Standard Squares. 



M" %" i" IJ4" IJ4" 



Other sizes than those specified may be obtained, but the time of 



delivery will be very uncertain unless the order is large enough to war- 

 rant a rolling. 



Deck beams, bulb angles and special section Z-bars are hard to 

 get unless ordered in large quantities. Flats y 2 " thick and under are very 

 hard to get. 



Flats under 4" should be ordered by y 2 " variation in width ; flats 

 and universal plates over 4" should be ordered by i" variation in width. 



