UNIVERSAL PORTLAND CEMENT CO. 
61 
2'V6"«3'-0" 
Cost of 
Forms 
Horse 
A Convenient and Easily Made Derrick for 
hoisting material. Design adopted from plans 
submitted by Iowa State College, Ames, Iowa. 
Forms of this type can be 
made for twenty-five to fifty dol- 
lars, and in one in- 
stance a farmer built 
an equipment similar 
to that described here at a cash 
outlay of only $15. Forms can 
generally be disposed of after use 
at a price equal to the total cash 
outlay to the builder, so that the 
use of these in building his silo 
only costs him his labor. A single 
set of forms is often used on several 
silos, each user selling his forms to 
the next man for a sum slightly 
less than what he paid for them. 
As the inner form is moved 
upwards it will be necessary to 
securely brace the up- 
Srac/? "^^^ supports. This 
Supports is very essential. No 
weak or rotten lumber 
should be used, and all bracing 
should be put where it will carry 
the load in the best and most se- 
cure manner. The double two-by-four supports recommended have 
ample strength to carry the weight if properly braced, but this precau- 
tion must not be neglected. 
The uprights should 
be braced at intervals of five 
feet (every two courses) with 
horizontal boards running 
from one upright to the next, 
and braced back against the 
wall as shown below. 
Boards l"x6" or 2"x4" will be 
large enough for this purpose. 
About every 15 feet braces 
should be run across to oppo- 
site uprights, 2x4" or 2x6" 
material being used. 
In handling the inner 
forms, great care must be ob- 
served in keeping 
the inside surface 
Importance 
of a Smooth « . i . , 
Wall the silo per- 
fectly smooth. 
Horizontal " steps in the wall j^i^.^.^^^^^ 3howing the method of bracing the upright 
are particularly Obiectionable. supports on which the inner forms rest. Bracing between 
-r, • . • (( L 5 5 J j_i adjacent uprights is put in every 5 feet; those joining 
rrOjectlOns, steps and other opposite uprights are put on every 15 feet. 
