40 
The Colorado Experiment Station. 
edge, just under each raising pulley, and a ring of baling wire may 
be tied in this hole to form a pulley attachment. Before the lug bolts 
of the outside form are loosened, the pulleys should be attached to 
these wires and locked to prevent the form from dropping. After 
the bolts are loosened the sheet iron should be freed from the wall 
at all points. The outside form may then be raised by men at each 
pulley rope inside the silo. The outside form should be brought to 
a level with the inside form, having a lap of two inches over the 
finished wall. The form is then tightened by drawing the lugs to¬ 
gether. The spacers should be so set that the distance between the 
inside and the outside form will be uniform. 
It is customary to raise the inside form first, but the system 
may be reversed if it becomes desirable to clean or grease the outside 
form. It is important that the outside form be tight at the time 
the inside form is forced out against the green wall. 
Silo Door .—The silo door should be started on the level of the 
floor or ground upon which the silage is to be delivered and for con¬ 
venience this should not be more than five feet above the bottom of 
the silo. 
Cut 7 shows a photograph of the silo door frame just placed 
in position against the inside form. It shows one ladder round 
which will be imbedded in the concrete under the door and shows 
how the iron pipes will be imbedded in the concrete on either side 
of the door. 
Constructing the Door Frame .—The door frame made up and 
ready for raising is shown in Fig. 4. The wooden framing is first 
constructed. The door jambs are made of 5 or 6-inch boards ac¬ 
cording to the thickness of the concrete wall. 2x2 pieces, which 
may be ripped from straight 2x4’s, are nailed on the outside of and 
what will be the front of these jambs as they stand against the inside 
form. Spreaders (c) (Fig. 4), ix4’s or 2x4^ are set between the 
jambs at intervals of about two and a half feet so that the jambs 
will stand twenty inches apart outside measure. In Fig. No. 4 one 
spreader is shown under each ladder round. Notches for the ladder 
rounds are then cut in the door jambs at intervals of twenty inches. 
The notches should be made about two and a half inches deep. The 
iron ladder may then be laid over this frame and the rounds placed 
in the notches prepared. The space between the pipes or ladder legs 
(d) and the jambs should be made equal on either side. The ladder 
may be held in position by wiring a few of the ladder rounds tightly 
to the jambs where the rounds pass the notches. 
Ladder Rounds .—The ladder rounds should be carefully made. 
Three-fourths inch rod iron should be used. The eye at either end 
