PART X. 



PAPERS ON LIVE STOCK, AGRICULTURAL 

 AND MISCELLANEOUS TOPICS 



FROM 



BULLETINS, AGRICULTURAL PRESS 



AND 



Papers Read Before County Farmers Institutes 



THE IOWA SILO, AMES, IOWA 



INTRODUCTION. 



For several years the staff of the Agricultural Engineering Section of 

 the Iowa Experiment Station has been making careful investigations 

 concerning modern silo construction and the success and merits of each 

 type now in use. The results of these investigations were first published 

 in Bulletin 100, which was distributed in July, 1908. The demand for 

 this bulletin was so large, not only from Iowa, but from other states, that 

 a second edition was published in July, 1909. This bulletin treated of all 

 the types of silo construction then in common use. 



Bulletin 100, in addition to the data concerning the common types of 

 silos, presented a design of a new silo, the walls of which were constructed 

 of hollow clay building blocks. Because of being presented by the Iowa Ex- 

 periment Station, it was called the Iowa Silo. Although a silo of this de- 

 sign was under construction at the time of the publication of the bulletin, 

 it was not possible to report in regard to its success in actual service. 



At the time of the second edition, the experimental Iowa silo had been 

 in actual service for one year and several other silos had been located 

 with walls constructed of material much similar to that originally proposed 

 for the Iowa silo. During 1909, several silos were built in different parts 

 or the state. The uniform success of these silos, a detailed report of which 

 will be given later, and the continued unshaken faith in the design, ma- 

 terial and construction of the Iowa type of silo, lead to the publication 

 of a bulletin treating of the merits and construction of this one particu- 

 lar type. Since the publication of the two editions of Bulletin 100, there 

 has been a large demand for information concerning the construction of 

 the Iowa silo. It is the purpose of Bulletin 117 to furnish this in a detailed 

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