STEEL 



23 



Brittleness is to be feared in high steel, although this quality 

 is not so dangerous when the metal is used in heavy reinforced 

 concrete members for example, in heavy beams or slabs 



Ransom e Bar 



Johnson Bar 



Thacher Bar 



Diamond Bar 



Cup Bar 



Cold Twisted Lug Bar 



FIG. 6. Deformed bars. 



as the concrete to a large extent absorbs the shocks and protects 

 the steel. Medium steel is manufactured and sold under stand- 

 ard conditions in the open market. This steel is of excellent 

 quality, and an engineer can feel sure of the safety of his structure 

 without the expense of exhaustive tests. As a rule, a satis- 



3 



