486 Bulletin 167. 



should be set in place so that the side corresponding to c. c. in 

 fig. 80 shall be on the outside of the silo. After the silo is set up 

 and the hoops have been put on and tightened the cutting out of 

 the doors may be completed. The size of doors would better be 

 two feet wide by about two and one-half feet long. This will allow 

 the passing through of a large basket and will make a door of 

 convenient size for handling. Before cutting out the doors cleats 

 2 inches by 3 inches and in length equal to the width of the door, 

 should be made which will conform to the circular shape of the 

 silo. One of these cleats should be securely bolted to the top 

 and one to the bottom of where the door is to be cut. (See fig. 

 80.) After the bolting, the door may be sawed out and it is 

 then ready for use. When set in place at time of filling the silo 

 a piece of tarred paper inserted at the top and bottom will fill the 

 opening made by the saw and prevent the entrance of any air 

 around the door. Two silos built at Cornell University the past 

 year had the doors constructed and put in, in the manner above 

 described and not one pound of silage was wasted around 

 doors. 



The silo roof. — If constructed in the barn no roof or covering 

 of any kind will be needed. If constructed out of doors some 

 kind of roof should be provided. If the method of construction 

 shown in fig 77 is followed, and the upright 6x6 posts are used, 

 these posts may serve as supports for the plates upon which the 

 rafters are to rest. The roof should have a sufficiently wide pro- 

 jection to protect as thoroughl}' as may be the walls of the silo 

 from the elements. The plan of roof construction which will 

 prove efficient is shown in fig 81. It is not necessary that the 

 structure be air tight above the circular part. The gable end 

 which is shown as open in the figure, may be boarded up. In 

 this gable end a door should be provided through which the silo 

 can be filled. The roof should extend from the silo to the barn 

 so as to cover the space which intervenes, and thus afford protec- 

 tion to the feeder in stormy weather. Another way in which the 

 roof may be put on is shown in the frontispiece. Around the top 

 of the silo was bent and nailed one-half inch Georgia pine. This 

 was put on so that a slight slope was given to the roof boards 

 which simply overlap each other. The roof answered every pur- 



