UNIVERSAL PORTLAND CEMENT CO. 
57 
of the University at Madison, and the Farmers' Institute form, 
Home-Made designed by Messrs. John and David Imrie of Roberts, Wiscon- 
Forms ^.^ Both of these forms have been used with great success 
among the farmers of Wisconsin and adjoining states and appear to be 
in many respects the most practical forms yet devised. On the oppo- 
site page is shown a model of the Farmers' Institute form. The model 
was obtained through the courtesy of Mr. David Imrie, who has in- 
troduced this form to hundreds of farmers in conjunction with the work 
of the Wisconsin Farmers' Institute. 
It is interesting to remember that there are more silos and probably 
more concrete silos in Wisconsin than in any other state in the union, and 
that today, Wisconsin leads in the value of dairy cows and the total value 
of their output. 
The list of materials for the inner form consists of sixteen segments 
or ribs made of sound 2x12 inch planks, sixteen cleats made of 2x16 inch 
. . plank, a number of 1x4 inch matched floor boards, a quantity 
of Forms ^ of No. 28 gauge galvanized sheet iron, and sixty-four ]4, inch 
bolts, 4^/2 inches long. The dimensions of the ribs, which vary 
with the silo diameter, will be found in the table of materials given on 
page 62. 
The first thing to do is to secure the materials necessary for the forms 
as given in the table. Make a compass or sweep of a plank or board 
with a spike attached to one end (for a center) and a crayon securely held 
at the other end (for a marker) . The distance from the spike to the marker 
should be 1 inch less than one-half the diameter of the silo (distance "R" 
on table) ; for a silo 14 feet in diameter the length of the sweep should be 
Second stage in using University of Wisconsin silo forms; illustrating the method of erecting 
scaffolding and holding it in place. 
