SILOS AND SILAGE. 195 
guarantee against springing out under the 
greatest pressure they are likely to undergo. 
The feeding door should be two and one-half 
to three feet wide and extend in sections from 
sill to within three or four feet of the top, each 
part being about five feet long. A space two to 
three feet wide should be left or iron rods should 
be placed in between the doors at sufficient in- 
tervals to make the wall perfectly strong. One 
or two extra studs on each side of door casing 
secure the strength of wall here. Boards as. 
long as the door is wide are placed horizontally 
in the frame, edge to edge and flush with the 
inside of silo, resting against cleats nailed on 
inside of casing or fitting into grooves. These 
boards may be put in place as the silo is filled. 
Weather boarding is not essential, though in 
the North it assists in reducing freezing. With- 
in the barn only the inside linings are at all 
necessary. 
Fasten cables or ties of timber across the tops 
of square or rectangular silos, attaching to op- 
posite studs, to prevent the walls from spread- 
ing. Ties every seven or eight feet will answer. 
Sills—tThe sills, well tarred, should rest on a 
good foundation that extends below frost line 
and be bedded in cement or mortar. Have the 
sills placed freely above the outside soil. In 
square or rectangular forms the sills must be 
anchored to the wall to keep them absolutely 
