246 



STATE BOARD OF AGRICULTURE. 



high and was lifted nearly 4 feet each time it was moved. It was 

 clamped to place by means of the hoops and lugs mentioned above and 

 shown in Figs. 6 and 7. 



Two strands of barbed Avire were built into the concrete every IS 

 inches in the loAver wall, as the forms were filled, and less frequently 

 as the building of the wall progressed. 



The proportion of cement and gravelly sand in the concrete of the 

 Avail is 1 to 7. 



Fig. 9. Cross-section of wall and forms of Porter silo. A. Section of wall showing position 

 of one of the reinforcing cables. B. Inner form and clamp used to spread it to place. ^ 



Mr. Smith has never placed a roof on this silo; 1st, because he has 

 never thought a roof necessary (there are a number of roofless silos in 

 the state) and 2nd, in filling the silo Mr. Smith stretches a piece of 

 wire netting above the top of the silo and is thus able to pile up an 

 extra 4 feet of ensilage material above the top of the silo, which in a 

 short time settles within the walls proper of the silo. 



Little freezing occurs next to the wall in this silo. 



THE L. A. PORTER SILO. 



Fig. 8 shows a view of the hollow walled cement silo of L. A. Porter, 

 Adrian, Mich. It has an inside diameter of 12 feet and stands 3G feet 



