CEMENT AND CONCRETE FENCE POSTS. 



TABLE NO. 4. Poured Posts.* 



Size, 4x4 inches at base, tapering to 3x3 inches at top. 

 feet 6 inches. Cured weight, 80 pounds. 



Length, o 



Sta. 



* This table is a summary of Tables 6 and 8, Bulletin 148, Colo. Exp. 



The Three Cornered Post. The following conclusions are 

 drawn after testing 23 triangular posts. Size, 7 inches on 

 each side at the bottom, tapering to 5 inches on each side at the 

 top. Mixture, i part cement and 3 parts sand, by measure. Cost 

 of material varying from 14 cents to 19 cents each. 



The three cornered post which is advocated to some extent, 

 does not have as many points in its favor as it may seem. In the 

 first place an equal amount of reinforcement in each corner of the 

 post cannot make a post of equal strength from two opposite direc- 

 tions. If a force is brought to bear against one of the flat sides 

 of the post towards the opposite corner, the material in the corner 

 will crush long before the wires will break on the side from which 

 the force is exerted. On the other hand, if a force is brought to 

 bear against one corner of the post towards the opposite flat side, 

 llie single reinforcement in the corner will break before the mixture 

 has begun to crush on the flat side. 



An extra reinforcement in the corner on which the force is 

 exerted towards the opposite flat side will make it practically as 

 strong as the flat side. But when the force is again applied to the 

 flat side towards the single corner which is doubly reinforced, the 

 mixture in the corner gives away too soon and it is no better than 

 with but a single reinforcement. 



