Silos and Silagl in Colorado. 
4i 
need not be welded, but should be made to fit over an inch pipe. The 
distance from the center to the center of the eye should be twenty- 
six inches. Unless all rounds are uniform in this respect they can¬ 
not be placed over the iron pipes. One-inch pipe is used for the lad¬ 
der legs. 
Base of Door. —A board (a) the length of the spreaders (c) 
and the width of the silo wall forms the base of the door frame. 
This must be sawed to the circle of the silo on either edge. A 2x2 
twenty-four inches long (b) and sawed on one side to the silo circle 
should be nailed to this bottom board, so that the shoulder formed 
by the 2x2 pieces on the door jambs may also extend across the bot¬ 
tom of the door. An iron strip (c) should be tacked on the under 
side of the bottom board flush with the straight-edge of the 2x2. 
This will form an iron sill at the bottom of the concrete door when 
the wooden framing is removed. 
Door Made in Sections .—The door should be made up in sec¬ 
tions 10 or 12 feet long, since longer sections cannot be erected or 
held plumb without great difficulty. Cut 6 shows a door standing 
in position. When the wall is completed to the height of this sec¬ 
tion another section will be erected. The pipes should be provided 
with shoulders and threads for the unions made where the door sec¬ 
tions join. 
Bolt Holes for Chute Attachment. —In case a chute is to be at¬ 
tached after the silo is complete it will be necessary to bolt 2x4’s on 
either side the door for the chute framing, %-inch bolt holes should 
be made in the silo wall at the time of construction for this purpose. 
They should be placed just outside the ladder pipe on either side the 
door, one about six feet above the other. These bolt holes may be 
made by laying blank bolts, as long as the wall is thick in the con¬ 
crete and then driving them out after the forms are raised. The 
bolts should be well greased with axle grease or some heavy grease, 
so that they may be driven out easily. Perhaps a better method 
than using the blank bolts is to use 5^-inch gas pipe, plugged at 
either end with mud, so they will not fill with concrete. These are 
left in the wall and the chute bolts are run directly through them. 
Plate Bolts .—If the silo is to be roofed, plate bolts must be set 
in the top course of the concrete wall. Two bolts should be set 
equally distant apart for each of the eight plate pieces used in build¬ 
ing the octagon roof. The bolts should be left about three inches 
in the clear and be embedded eight inches in the concrete. T*he end 
embedded in the concrete should be bent to “L” shape to prevent its 
working loose. The entire bolt will, therefore, be about fourteen 
inches long. Rod iron may be threaded and used for this purpose. 
Working Force .—The silo forms should be filled each day. 
