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IOWA DEPARTMENT OF AGRICULTURE 



The forms for making the reinforced concrete doorways, although of 

 much the same character as those required for malting a concrete silo 

 wall, are much more easily handled and are quite simple. The scaffold 

 for building the silo has been carefully worked out. The roof construc- 

 tion is simple and should not give anyone trouble who is familiar with 

 concrete work in any form. The simplicity of the construction of the Iowa 

 silo is indicated in Fig. 6, which shows a wagon loaded with all of the 

 scaffold, derrick, guide, mortar box, and tools used in construction of the 

 16x35 foot silo and roof shown at the left. A further idea of the simplicity 

 and rapidity with which the Iowa silo can be constructed can be formed 

 from Figs. 7, 8, 9 and 10, which show the daily progress of constructing a 

 silo 18 feet in diameter with two masons and helpers at work. 



COST. 



An attempt has been made to determine accurately the cost of the orig- 

 inal thirteen Iowa silos. A definite statement is hard to get, since in 

 almost every instance the farm force assisted to a more or less extent, In- 

 troducing items of labor, haulage, etc, difficult to estimate. The owners 

 in most instances prefer not to take these items into account, yet in making 

 a complete statement, they must be included. 



Silo No. 1, owing to the fact that it was an experimental silo and that 

 some of the material was secured at a cost below normal, is not listed here. 



Silo No. 2 was built under normal conditions but certain experiments 

 increased its cost to some extent over the next silo which was built. The 

 development of certain features of construction, especially the scaffold, 

 was a large factor in reducing the cost of those constructed later. 



Fig. 6. 



Total equipment including Derrick, Scaflold, Guide, Mortar Box and 

 all tools required to build the Iowa Silo. 



