EXPERIMENT STATION BULLETINS. 



245 



For forms there were used : 



1100 feet lumber % i^^'^i ^ ^ Ji^<^*h x 16 feet, 

 4 hoops ^2 I'oiind irou with lugs, 

 30 pounds nails. 



Fig. 8. Cement silo built and owned by L. A. Porter, Adrian, Mich. 



A total of 31 days of labor was expended upon the construction. It 

 would require considerably less labor for the same parties to build 

 another silo of the same size after having acquired more experience. 



A study of Figs. 6 and 7 will give the reader a fair idea of the kind 

 of forms used and the manner of using them. The inner form was 16 

 feet high and had to be moved but once. The outer form was 4 feet 



